CYR, Circuit Judge.
Three youthful defendants, Saul Mangual-Corchado (“Mangual”), Luis Antonio Ramirez-Ynoa (“Ramirez”) and Ernesto Cirilo-Munoz (“Cirilo”), appeal their respective convictions relating to the intentional killing of an on-duty police officer during the commission of a drug offense. See 21 U.S.C. § 848(e)(1)(B); 18 U.S.C. § 2. Mangual and Ramirez likewise appeal their carjacking convictions, see id. § 2119, and their convictions for using a firearm to commit the carjacking, see id. § 924(e). We affirm the district court judgments;
I
BACKGROUND1
Over an extended period of time prior to November 1,1994, Mangual, Jose Lugo-San-ehez (“Lugo”), and David Silva worked regular nine-hour shifts selling marijuana, cocaine, and heroin seven days a week at a “drug point” immediately outside “Cafetín El Ideal” in Trujillo Alto, Puerto Rico.2 Then-mutual drug suppliers were Yito Morales and a person known only as “Chispo.” Lugo correctly suspected that a particular drug customer — Ivan Mejias-Hemandez (“Meji-as”) — was an undercover police officer. Consequently, during late October 1994 Chispo ordered Lugo to kill Mejias. Lugo in turn promptly informed codefendant Ramirez that Mejias was to be killed on Chispo’s instruction. The precise circumstances surrounding the Mejias murder are central to these appeals.
On November 1, shortly after beginning a regular shift with David Silva at the El Ideal drug point, Lugo began ingesting cocaine.3 Between 10:00 and 11:00 a.m., Offi[38]*38cer Mejias arrived in plain clothes and took a position beside the two-door, white Suzuki hatchback which he had parked in front of El Ideal. Around 11:15 a.m., Lugo called Ramirez from a pay phone located near one entrance to the El Ideal building. Lugo informed Ramirez that Mejias had arrived, then told him to bring “the gun” — with which Lugo proposed to kill Mejias — and “the car” to El Ideal. Ramirez, who had no driver’s license and was just learning to drive, expressed reluctance to drive the ear to El Ideal himself. Undeterred, Lugo responded simply: “I know that you can handle it.”
Not later than 12:30 p.m., Ramirez arrived at El Ideal in a black Oldsmobile, with the revolver, as instructed. Cirilo arrived within ten to fifteen minutes and was greeted by Lugo. Lugo testified at trial that he said nothing to Cirilo about the impending plan to murder Mejias.
Shortly thereafter, Lugo explained to Silva that he was going across the street to the stoop of a nearby building so he could keep an eye on the El Ideal drug point in ease a customer came. Officer Mejias, with Ramirez and Silva following behind him, proceeded across the street as well. Upon reaching the stoop, Lugo and Mejias immediately engaged in a heated discussion, during which Mejias proceeded to let Lugo know that he had read Lugo’s lips earlier that morning when Lugo had suggested to Silva that Mejias was a police informant. Lugo, who was continuing to ingest cocaine, became very upset and said he knew Mejias was an informant.
As Silva and Ramirez neared the stoop, Lugo walked back to El Ideal, then returned to the stoop a short time later and asked Ramirez for the keys to the black Oldsmobile. After retrieving the Ramirez revolver from the black Oldsmobile in front of El Ideal, Lugo returned to the stoop and handed the Oldsmobile keys to Ramirez.
While walking back toward El Ideal a third time, with the Ramirez revolver concealed in his waistband, Lugo encountered Mangual, Cirilo, and Yito Morales (who, along with Chispo, supplied the drugs Lugo and Mangual sold at the El Ideal drug point) and attempted to “fire them up” to “prender-lo” (“beat up”) Mejias. After Mangual, Cirilo and Yito failed to take up Lugo’s challenge, and while all four were returning to the stoop together, Mangual offered instead to circle around behind Mejias while Lugo confronted Mejias with the Ramirez revolver so they could secure the keys to the white Suzuki in which Mejias had arrived at El Ideal, and search for his weapon.4
After the unarmed Mejias had been seized at gunpoint as suggested by Mangual, Lugo remained near the stoop with Mejias while Ramirez, Mangual, Yito, and Silva returned to El Ideal to search the Suzuki for the suspected Mejias weapon. Lugo testified at trial, without contradiction, that Cirilo was standing “real close” as Mangual and Ramirez retrieved the Mejias weapon from the white Suzuki. Multiple palm and fingerprints, lifted from the exterior of the Suzuki on the passenger side, were identified as belonging to Cirilo as well. Lugo then reminded Mejias that he was carrying a weapon under his shirt and walked behind him from the stoop to the Suzuki. After Mejias had retrieved the keys to the Suzuki, Lugo told him to get into the Suzuki “and not to come around there anymore.”
[39]*39Just as Mejias turned on the ignition and was about to leave, however, yet another young man, who also hung around El Ideal and was identified at trial only as “Papilin,” told Lugo: “You have to take him ... because he might come back.”5 Lugo thereupon abruptly instructed Mejias, at gunpoint, to get out of the driver’s seat and into the back seat of the Suzuki.6 While Mejias and Lugo entered the back seat, Mangual got into the driver’s seat. As soon as the doors to the Suzuki were closed, Mangual drove the Suzuki out of the El Ideal parking area onto the highway and observed that “the others were following ... in a black Oldsmobile two-door.”7
The Suzuki, followed by the black Oldsmobile driven by Cirilo, then proceeded easterly on the highway fronting El Ideal, past a store 50 yards distant, then through two intersections to a small valley. There, notwithstanding his pleas for mercy, Mejias was shot twice by Lugo; first in the abdomen, then in the head.8
[40]*40Two or three minutes after departing El Ideal, Mangual stopped the Suzuki at a school crossing, where Yito Morales, one of the drug suppliers, pulled alongside on a motorcycle. As soon, as Lugo signaled that Mejias was already dead, Yito nodded and drove off. Moments later Lugo spotted the black Oldsmobile, and the Suzuki proceeded on. Once again the Oldsmobile followed, with Cirilo still at the wheel and Ramirez in the passenger seat.
A little later, after noticing that the Oldsmobile was nowhere in sight, Lugo told Man-gual to double back until the Suzuki came upon the Oldsmobile, whereupon the two vehicles drove into a nearby cemetery and parked.9 At this point in time, whether on his own initiative or on prior instruction from Yito, Ramirez asked Lugo if he was sure Mejias was dead. When Lugo said “no,” Ramirez fired two shots into the victim’s head, then got in the passenger seat of the Suzuki beside Mangual.
As Cirilo and Lugo led the way from the cemetery in the black Oldsmobile, Cirilo ingested cocaine provided by Lugo. With Man-gual driving and Ramirez in the passenger seat, the Suzuki followed the black Oldsmobile to a nearby quarry. There the Suzuki— carrying the Mejias remains — was pushed over an embankment by Ramirez and Man-gual, but became suspended and did not drop to the quarry floor.
After Ramirez and Mangual scurried back to the Oldsmobile, Cirilo drove them and Lugo to a successful getaway. Later, the $240 Lugo had removed from the dead officer’s body before dumping the Suzuki was divided equally among them.
In due course, Mangual, Ramirez, Lugo and Cirilo were indicted for aiding and abetting the murder of an on-duty police officer during the commission of a drug offense, 21 U.S.C. § 848(e)(1);10 18 U.S.C. § 2;11 carjacking, id §§ 2119,12 and using a firearm during the commission of a carjacking, id. § 924(c).13
Ultimately, Lugo entered into a plea agreement, testified for the prosecution, and received a twenty-year prison sentence. Fol[41]*41lowing a ten-day trial, the jury returned ver-diets against Mangual and Ramirez on all three counts. Cirilo was acquitted of the carjacking and firearm charges, but convicted of aiding and abetting the Mejias murder. All three appellants were sentenced to life imprisonment. :
II
DISCUSSION
A. Motion to Dismiss Indictment (Mangual, Cirilo, Ramirez)
Appellants first maintain that it was error to disallow their pretrial motion to dismiss'the indictment. Relying on United States v. Basurto, 497 F.2d 781 (9th Cir.1974), they argue that the indictment violated due process because the government knew it was based in material part on the testimony of Special Agent Rene F. Medina, who related to the grand jury two perjured versions of the relevant events previously provided by Lugo.14
After a grand juror voiced concern about Lugo’s credibility, Agent Medina expressed the belief that Lugo had recognized the implausibility of his first story and decided to “come clean.” However, Medina did not disclose to the grand jury that Lugo, at a later debriefing, had corrected yet other “inaccuracies” in his second version. Finally, after the grand jury returned the indictment, Lugo came forward with a third version, essentially recasting the four codefendants in the respective roles later ascribed to them by Lugo at trial.
Appellants maintain that (i) Lugo’s prevarications, as relayed by Agent Medina, were the only competent evidence upon which the grand jury could have based its indictment, (ii) Agent Medina’s “come clean” characterization of Lugo’s second version misled the grand jury into believing it was the whole truth, whereas it contained yet other “inaccuracies,” and (in) at the very least the government owed a duty under Basurto to return to the grand jury after Lugo had come forward with the third version.15
Basurto has been accorded mixed reviews, even by the court which decided it. See United States v. Bracy, 566 F.2d 649, 654-55 (9th Cir.1977), stay denied, 435 U.S. 1301, 98 S.Ct. 1171, 55 L.Ed.2d 489 (Rehnquist, Circuit Justice 1978) (suggesting that government’s use of grand jury testimony which later proves to have been perjurious never implicates defendant’s Fifth Amendment rights), cert. denied, 439 U.S. 818, 99 S.Ct. 79, 58 L.Ed.2d 109 (1978). For our part, we have declined to endorse Basurto on several occasions. See United States v. Garcia-Rosa, 876 F.2d 209, 232 .(1st Cir.1989), vacated on other grounds, 498 U.S. 954, 111 S.Ct. 377, 112 L.Ed.2d 391 (1990); United States v. Maceo, 873 F.2d 1, 3 (1st Cir.1989); United States v. Rivera-Santiago, 872 F.2d 1073, 1088 (1st Cir.1989); United States v. Flaherty, 668 F.2d 566, 584 (1st Cir.1981).
Moreover, even under Basurto it is extremely doubtful that the variance in Lugo’s descriptions of the events relayed to the grand jury by Agent Medina, however troubling, was sufficiently “material” to require dismissal of the indictment. See Basurto, 497 F.2d at 785. For one thing, after the unsuccessful attempt to exculpate himself in the first post-arrest interview, Lugo directly implicated Mangual, Ramirez, Cirilo, and himself, albeit even then without complete consistency in certain nonexculpatory details (e.g., how Mejias and Cirilo were dressed) or the respective roles of the participants.
[42]*42Furthermore, were Basurto thought to require a determination as to whether the grand jury would have indicted had it been fully apprised of all the inconsistent pretrial statements made by Lugo, we would have to respond in the affirmative, especially since the petit jury found appellants guilty beyond a reasonable doubt after an exhaustive probe into all of Lugo’s prevarications, including others which occurred at trial.16 See Rivera-Santiago, 872 F.2d at 1088 (“[TJhis error was cured by the verdict of the petit jury, which was made aware during trial of [the government witness’s] past perjury.”); see also United States v. O’Brien, 14 F.3d 703, 706 (1st Cir.1994) (credibility assessments reserved for factfinder).' As the trial jury found guilt beyond a reasonable doubt, we are not persuaded that a similarly informed grand jury would not have found probable cause.17
B. Motion to Replace Appointed Counsel (Ramirez)
Claiming a total breakdown in the attorney-client relationship, Ramirez sought to replace court-appointed counsel three weeks before trial. He alleged that appointed counsel had refused to turn over in timely fashion documents Ramirez wished to review, refused to intervene with prison officials after Ramirez was placed in special punitive confinement, and failed to conduct an adequate investigation or to consult with Ramirez in preparing a defense.
As there is no absolute right to replace appointed counsel, see United States v. Machor, 879 F.2d 945, 952 (1st Cir.1989), we review the district court ruling for abuse of discretion only, United States v. Richardson, 894 F.2d. 492, 496 (1st Cir.1990), after assessing, inter alia: (i) the timeliness of the request, (ii) the adequacy of the inquiry into the defendant’s concerns, and (iii) whether the conflict between client and counsel resulted in a total lack of communication and precluded an adequate defense. Id. The challenged ruling was well within the district court’s discretion.
The trial judge repeatedly urged Ramirez to particularize the grounds for his dissatisfaction with appointed counsel, then followed up with probing questions directed to counsel.18 Counsel assured the court that he had explained all aspects of the case to Ramirez and that he had been prepared for trial.19 Furthermore, Ramirez acknowledged that counsel ultimately delivered all requested documents and discussed the case with him on the five or six occasions he visited Ramirez in prison. See, e.g., United States v. Pierce, 60 F.3d 886, 891 (1st Cir.1995) (finding no abuse, even where lawyer-client relationship was “beset with problems,” because lawyer and client were “conversing with one another”). The district court did not abuse its discretion in determining that the grounds advanced by Ramirez failed to demonstrate the requisite “total lack of communication.”
[43]*43C. Sufficiency of the Evidence (Ramirez)20
Ramirez claims that the government adduced insufficient evidence to establish, beyond a reasonable doubt, all elements of the three charged offenses. See supra notes 10-12. He relies primarily on the contention that the trial testimony provided by Lugo was crucial to his conviction and that Lugo demonstrated conclusively that he is an inveterate liar.21
Although fully informed of Lugo’s prevarications, as well as the generous terms of his plea agreement with the government, the verdicts substantiate that the jury none-, theless credited Lugo’s trial testimony at least in part. Lugo testified that he promptly informed Ramirez, his friend since childhood, that Chispo had ordered Lugo to kill Mejias, and that Ramirez later complied with Lugo’s November 1 telephonic instruction to deliver the revolver and the black Oldsmobile to El Ideal. See United States v. Fountain, 768 F.2d 790, 798, modified on other grounds, 777 F.2d 345 (7th Cir.1985). Moreover, the El Ideal owner on duty the morning of November 1 testified that she overheard the phone conversation Lugo had with Ramirez, during which Lugo talked about killing “the guy” (i.e., Officer Mejias). In addition, a search of the Ramirez residence disclosed incriminating circumstantial evidence corroborating Ramirez’ close association with Lugo and his ready access to weapons.22 Nor did any other trial evidence, see, e.g., supra note 21, constrain the jury to reject Lugo’s corroborated testimony that Ramirez intentionally participated in the charged offenses, see supra note 20.23
[44]*44D. Sufficiency of the Evidence (Cirilo)
1. Applicable Law
The government was required to prove beyond a reasonable doubt that Mejias was murdered by Lugo, the alleged principal, and that Cirilo “consciously shared” Lugo’s criminal design, associated himself with it, and actively sought to ensure its success. See United States v. Spinney, 65 F.3d 231, 235 (1st Cir.1995); see also United States v. Ruiz, 105 F.3d 1492, 1499 (1st Cir.1997); United States v. Loder, 23 F.3d 586, 591 (1st Cir.1994); United States v. Francomano, 554 F.2d 483, 486-87 (1st Cir.1977). Thus, in the present case the specific-intent element for aiding and abetting a violation of 21 U.S.C. § 848(e)(1)(B) required proof beyond a reasonable doubt that Cirilo, before the murder occurred, consciously shared Lugo’s intention to kill Mejias and sought to ensure the success of the criminal enterprise by operating the black Oldsmobile used to effect the getaway after the Suzuki had been dumped. See Spinney, 65 F.3d at 235; United States v. de la Cruz-Paulino, 61 F.3d 986, 998-1000 (1st Cir.1995). Even assuming, arguendo, that Cirilo’s actions after the Mejias murder are insufficient to establish his foreknowledge, see United States v. Andrews, 75 F.3d 552, 557 n. 5 (9th Cir.), cert. denied, 517 U.S. 1239, 116 S.Ct. 1890, 135 L.Ed.2d 183 (1996), those actions may provide support for a reasonable inference regarding his foreknowledge.
2. Standard of Review
We review de novo the district court’s determination that the jury reasonably found “each element of the crime to have been proven beyond a reasonable doubt....” United States v. Houlihan, 92 F.3d 1271, 1295 (1st Cir.1996) (reversing conviction for aiding and abetting murder) (emphasis added), cert. denied, — U.S. -, 117 S.Ct. 963, 136 L.Ed.2d 849 (1997). We must consider the evidence as a whole, together with all rational inferences therefrom, in the light most favorable to the government. Loder, 23 F.3d at 589; United States v. Batista-Polanco, 927 F.2d 14, 17 (1st Cir.1991). Where de novo review discloses that essential jury findings on knowledge or specific intent were purely speculative, an aiding and abetting conviction cannot stand. See, e.g., Houlihan, 92 F.3d at 1295; Spinney, 65 F.3d at 235 (reversing conviction for aiding and abetting use or carrying of firearm by principal during crime of violence); de la Cruz-Paulino, 61 F.3d at 1002 (vacating conviction for aiding and abetting possession of cocaine with intent to distribute).
As in any case, of course, “ ‘[w]e defer, within reason, to inferences formulated by the jury in the light of its collective understanding of human behavior in the circumstances revealed by the evidence.’ ” United States v. Guerrero, 114 F.3d 332, 339 (1st Cir.1997) (quoting United States v. Passos-Patemina, 918 F.2d 979, 985 (1st Cir.1990)). Furthermore, the jury is entitled to rely on a chain of reasonable inferences, as long as each constituent inference is rooted in the evidence. See Spinney, 65 F.3d at 237-38. Finally, it is important to point out that though the “beyond-reasonable-doubt burden applies to ‘every element’ of each offense eharged[,][it] neither [applies] to all the subsidiary inferences nor to ‘every hypothesis consistent with the defendant’s innocence.’ ” United States v. Roberts, 119 F.3d 1006, 1017 (1st Cir.1997) (quoting Spinney, 65 F.3d at 234) (emphasis added).
3.Mere Presence and Association
Cirilo essentially maintains that his proven participation — in operating the getaway vehicle, disposing of Mejias’ body, and sharing the “spoils” removed from it — though arguably adequate to demonstrate that he was an accessory after the fact, see 18 U.S.C. § 3, did not establish the requisite preexistent intent to aid and abet the Mejias murder. See 21 U.S.C. § 848(e)(1)(B); 18 U.S.C. § 2; supra notes 10 & 11. Thus, Cirilo correctly contends that something more than “mere presence” and “mere association” is required, see, e.g., United States v. Montilla-Rivera, 115 F.3d 1060, 1064 (1st Cir.1997); that is to say, the evidence, direct and circumstantial, must establish beyond a reasonable doubt that he not only associated himself in some manner with the Mejias murder, as the evidence plainly shows, see infra Section II.D.4, but that he did so after acquiring the requi[45]*45site knowledge that Lugo intended to kill Mejias.
For its part, the government relies first and foremost on Cirilo’s presence throughout virtually the entire period immediately preceding and including the capture and abduction of Officer Mejias, Cirilo’s longstanding association with Lugo and Mangual, and his direct involvement in the events which unfolded from the time the white Suzuki departed the El Ideal premises carrying Lugo, Mangual and Mejias. See, e.g., United States v. Luciano-Mosquera, 63 F.3d 1142, 1150 (1st Cir.1995) (“mere association” defense), cert. denied, 517 U.S. 1234, 116 S.Ct. 1879, 135 L.Ed.2d 174 (1996); Batista-Polanco, 927 F.2d at 18 (“mere presence” defense).24
4. Evidence of Foreknowledge
Cirilo allows that the government may have adduced sufficient evidence that he knew Lugo intended to “beat up” Officer Mejias, but argues that it adduced no direct evidence that he knew, at any time, that Lugo intended to murder Mejias. We note as well that any jury finding regarding Cirilo’s foreknowledge and intent could not have been predicated on his lack of credibility, since Cirilo did not testify. Nor did any witness testify that Cirilo had been told of Lugo’s lethal intentions before Mejias was abducted in the Suzuki, nor that Cirilo ever admitted knowing that Lugo harbored such intentions. See, e.g., Loder, 23 F.3d at 592 (rejecting, as “too weak,” an inference that because defendant helped principal dismantle car, principal had communicated to defendant that purpose of dismantling was to facilitate an insurance fraud by the car owner, absent any evidence that defendant had been informed of the scheme, or that defendant ever mentioned the scheme). Instead, Cirilo points out, Lugo — the chief prosecution witness and, at least arguably, the person most likely to have informed Cirilo of the murder plan — testified without contradiction that Cirilo was completely in the dark about the murder plan on November 1. Cf. Houlihan, 92 F.3d at 1294-95.
The prosecution need not adduce direct evidence, of course, but may rely entirely on circumstantial evidence to establish beyond a reasonable doubt each element of the crime charged, see United States v. Valerio, 48 F.3d 58, 63 (1st Cir.1995); United States v. Akinola, 985 F.2d 1105, 1109 (1st Cir.1993), including the alleged aider and abettor’s foreknowledge, see Spinney, 65 F.3d at 235; de la Cruz-Paulino, 61 F.3d at 999 n. 9; United States v. Taylor, 54 F.3d 967, 975 (1st Cir.1995); Loder, 23 F.3d at 592. In other words, “the criminal law does not place a special premium on direct evidence,” O’Brien, 14 F.3d at 706, and a defendant’s intent may be inferred from the circumstances and the actions of the defendant. See Valerio, 48 F.3d at 63. Moreover, where [46]*46the evidence as a whole is sufficient to support the verdict, the government “need not rule out every other reasonable hypothesis of innocence.” O’Brien, 14 F.3d at 706.
A network of record facts, see supra note 3, prominently supported a rational inference that the longstanding association among Lugo, Mangual and Cirilo at El Ideal was neither entirely casual nor exclusively social. In the first place, the evidence plainly disclosed that Chispo (along with Yito Morales) supplied the drugs Lugo and Mangual — Ciri-lo’s constant companions at El Ideal — sold at the- El Ideal drug point. Furthermore, at trial Lugo was asked about a post-arrest FBI debriefing in which he falsely east Cirilo as the principal planner and triggerman in the Mejias murder. At that time Lugo had informed the FBI that Cirilo committed the murder to pay off an outstanding drug debt due Chispo, the same person who ordered Lugo to kill Mejias. Although Lugo later disavowed the earlier FBI debriefing as a partial fabrication as concerned the identity of the actual killer, see generally supra Section II.A, he nevertheless testified at trial that Cirilo did indeed owe Chispo money, without identifying the amount or nature of the obligation. Moreover, there was neither evidence nor argument that Chispo was engaged in any other business, activity or endeavor which would account for the debt owed him by Cirilo.
In all events, given Ramirez’ demonstrated reluctance even to drive the getaway car to El Ideal, not to mention the inherent risk in relying upon an inexperienced, unlicensed driver for so dangerous and important a responsibility in these stressful circumstances, we think the suggested inference of mere presence and association is not only counter-intuitive, but considerably less plausible than the inference that Cirilo was there to drive the Ramirez automobile, as corroborated by, inter alia, the ready acceptance accorded him among the three other defendants from the time he arrived at El Ideal, including most of the pre-capture period and throughout the capture and abduction. See, e.g., Montilla-Rivera, 115 F.3d at 1064 (“Criminal conspirators do not often ‘welcome innocent nonparticipants as witnesses to their crimes.’ ”); Batista-Polanco, 927 F.2d at 18 (“[T]he factfinder may fairly infer ... that it runs counter to human experience to suppose that criminal conspirators would welcome innocent nonparticipants as witnesses to their crimes.”).25 Moreover, immediately after the doors of the Suzuki were closed Cirilo got into the driver’s seat of the Ramirez Oldsmobile and followed behind the Suzuki, which was carrying Lugo, Mangual and the suspected police officer whom Cirilo had just seen captured and abducted at gunpoint moments after having been told he could leave unharmed. See supra Section I.
In our view, therefore, the evidence supported a rational jury inference that Cirilo, who was indebted to the same drug supplier who ordered Lugo to murder Mejias, did not appear at El Ideal by mere happenstance minutes after the getaway vehicle and the murder weapon were delivered by Ramirez; nor by odd coincidence innocently associate thereafter in the high-stakes criminal enterprise of capturing, abducting, and carjacking a suspected police officer. See Guerrero, 114 F.3d at 343 (“Although these facts, in isolation, do not necessarily lead to the conclusion that the [defendants] knew ..., in combination [ ] they constitute more than enough evidence to support a finding of positive knowledge _”) (emphasis added).26
[47]*47For his part, Cirilo proposes no reasoned argumentation which would preclude a rational jury — employing its experience, reason, common sense, and understanding of human behavior, see, e.g., id. at 3B9 — from inferring that the three other defendants would not have welcomed him in their immediate presence during the capture, carjacking, and abduction of Officer Mejias, unless it were well understood among them that Cirilo shared their knowledge and criminal intent. See Batista-Polanco, 927 F.2d at 18. Instead, ignoring the incriminating circumstantial evidence, or according it 'piecemeal attention, but see O’Brien, 14 F.3d at 707, Cirilo focuses on the direct evidence which comports with his mere presence and association; principally, Lugo’s testimony that Cirilo had not been told, and did not know, Mejias was to be killed, but only that he was to be assaulted.
We address this contention against the backdrop of the entire record, viewed favorably to the government, to determine whether the aiding and abetting verdict was adequately supported. See, e.g., Guerrero, 114 F.3d at 339; O’Brien, 14 F.3d at 707. No direct evidence enabled a finding that Cirilo knew, prior to his arrival at El Ideal on November 1, that Lugo intended to harm Officer Mejias in any way. Moreover, Lugo testified without contradiction that he never told Cirilo that Mejias was to be killed, but merely urged that Cirilo, inter alios, “beat up” Mejias.27
We conclude nonetheless that the evidence afforded adequate support for a reasonable jury inference that Cirilo acquired the requisite knowledge in the course of the riveting events that transpired in his immediate presence, from the time Lugo attempted unsuccessfully to incite Ramirez, Mangual and Cirilo to beat up Officer Mejias, see supra Section I, through the point in time when Lugo’s flagrant actions — as Mejias was about to leave unharmed in the white Suzuki — made it unmistakably clear that Lugo was not going to release Mejias at all. We trace these constituent inferences step by step. See Spinney, 65 F.3d at 234.28
Lugo’s uneontroverted testimony, together with the four Cirilo prints lifted from the hood of the Suzuki itself, were sufficient to establish, beyond a reasonable doubt, that Cirilo was standing “real close” to the Suzuki as Mangual and Ramirez searched for the [48]*48Mejias weapon at Lugo’s direction. See supra Section I. Moreover, there was no evidence and no contention that Cirilo departed from the immediate vicinity of the Suzuki until it exited the El Ideal parking area immediately after Mejias was abducted by Lugo, at which point Cirilo, without hesitation, got into the driver’s seat of the Ramirez Oldsmobile and followed the Suzuki onto the highway fronting El Ideal.
Consequently, the jury reasonably could find that Cirilo witnessed the events which took place at this critical juncture: first, as Lugo suddenly ordered Officer Mejias to get into the driver’s seat of the Suzuki “and not come around there anymore;” then, moments later, as Lugo — in an abrupt about-face following immediately on the heels of the Papi-lin warning to “take” (“Mil”) Mejias “because he might come back” — ordered Mejias at gunpoint to get out of the front seat and into the back seat of the SuzuM. See supra note 5. Whether the jury considered Papilin merely the messenger or something more, at that point it reasonably could conclude that the message itself — that Mejias was not going to be released after he had been abducted— hardly could have gone unheeded by Cirilo. See Spinney, 65 F.3d at 237 (“Jurors are ‘not expected to ignore what is perfectly obvious,’ but, rather, ‘to take'full advantage of their collective experience and common sense.’”) (citations omitted). Finally, after Lugo got into the SuzuM beside Mejias, revolver in hand, Mangual replaced Mejias in the driver’s seat. Whereupon Cirilo in turn promptly got behind the wheel of the Ramirez Oldsmobile and followed the SuzuM onto the highway.
Even assuming Cirilo had not become consciously involved earlier, the jury therefore reasonably could have found that what transpired in his immediate presence, before the SuzuM departed El Ideal, undermined any inference of innocent participation thereafter, particularly in light of Cirilo’s unchallenged presence among the other defendants throughout almost the entire pre-capture period and his unhesitating aid to their criminal enterprise during the post-abduction and post-murder stages.29 See, e.g., Batista-Polanco, 927 F.2d at 18 (“‘understanding of human behavior’ may ground reasonable inference from circumstantial evidence”).
For these reasons, therefore, we hold that the jury rationally could infer that Cirilo, at least by then, possessed the requisite conscious knowledge that Lugo intended to kill Mejias in order to make certain that he could not come back, as Papilin had forewarned in Cirilo’s immediate presence; and further that immediately thereafter — as plainly evidenced by his affirmative conduct — Cirilo shared and sought to facilitate Lugo’s criminal purpose by driving the getaway vehicle.
Although the foregoing analysis is substantiated by various subsidiary inferences as well, the most telling evidence was Lugo’s sudden, about-face decision not to release Mejias, which indicated unmistakably that he had heeded the Papilin warning that the defendants, inter alios, would be exposed to a greatly increased risk of apprehension, prosecution and punishment were Mejias to be released after having been abducted, carjacked and assaulted at gunpoint. Viewed in context, Lugo’s decision — that Mejias was not going to be released after all — severely undercut any inference that Cirilo was not consciously aware, from that moment on at least, that Lugo intended to ensure that Me-jias not “come back” as Papilin had advised. Notwithstanding the rapidity of the ensuing events, therefore, the flagrant developments witnessed by Cirilo immediately before the SuzuM left El Ideal plainly permitted a reasonable inference that — by then, if not sooner — Cirilo had (i) acquired the conscious knowledge that Mejias was to be killed and [49]*49(ii) formulated the requisite intent to aid and abet the murder by following the Suzuki in the Ramirez Oldsmobile, thereby ensuring his criminal associates their only means of effecting a safe getaway.
Accordingly, we conclude that the uncon-troverted evidence that Cirilo was present earlier, when Lugo tried to incite him, Man-gual, and Ramirez to assault Mejias, undermined any inference that Cirilo, from that time forward, remained a mere bystander innocently caught up in a secret plot among his longtime associates to assault and abduct a suspected police informant. Furthermore, the uncontroverted evidence that Cirilo also was present later — as Lugo instructed Meji-as to leave and not return, then countermanded that instruction in direct response to Papiliris warning that Mejias had to be killed “because he might come back” — eroded any rational inference that Cirilo’s operation of the getaway vehicle thereafter was undertaken without the requisite foreknowledge and shared intention to facilitate the Mejias murder.
Ill
CONCLUSION
The district court judgments are affirmed.