[1095]*1095SCHWELB, Associate Judge:
On October 26, 1983, Reginald Brooks was convicted by a jury of one count each of burglary in the second degree, D.C.Code § 22-1801(b) (1981), malicious destruction of property, id. § 22-403, breaking and entering a vending machine, id § 22-3427, and petit larceny, id. § 22-2202. On appeal he contends, among other things,1 that the trial judge committed reversible error by instructing the jury, after it had commenced its deliberations, with respect to the law of aiding and abetting. Brooks claims that the case was tried on the theory that he was the principal and that there was no evidentiary basis for the notion that he aided and abetted another principal in the commission of the crime. We agree with Brooks’ contention, and therefore reverse his conviction.
I
THE EVIDENCE
This case arises out of an incident which occurred more than nine years ago. On Sunday, February 21, 1982, according to the prosecution witnesses, someone broke into the Lincoln House Restaurant, which is located near Ford’s Theatre at 10th and E Streets in Northwest Washington, D.C. The rear door of the establishment was taken off its hinges. The intruder attempted to tamper with the office door and the safe and broke into the cigarette machine. Several liquor bottles were removed from a storage area behind the bar and placed in a bag in the center of the floor; other bottles were found standing on the bar. There was no dispute at trial that a burglary and related offenses had been committed by someone. It was the prosecution’s theory that the someone was Reginald Brooks.
The government introduced a substantial amount of evidence to prove its case; we describe only that portion of it which is relevant to the issues at hand. Briefly, the restaurant was closed on the day of the crime. The owner came to the premises and heard banging noises emanating from the direction of the back door in the basement. After a brief attempt to investigate, he called the police and waited for officers in the front of the restaurant.
Officers Tyrie Wharton and Allan Waters were the first to arrive. Officer Wharton went to the front of the building, while Officer Waters covered the back. The owner remained with Officer Wharton, and both looked into the restaurant through a window near the front door. They noted that the cigarette machine had been moved several feet from its normal location, and they then spotted a man crouched down near the contraption, apparently trying to pull it. Officer Wharton noticed that the man was wearing a plaid sweater which, as she recalled, contained the colors red, rust and brown.
In the meantime, when Officer Waters arrived at the rear of the establishment, he saw a woman, later identified as Cynthia Murphy, standing in an alley near the open front of a garage adjoining the restaurant. In the garage, a few feet from Ms. Murphy, the officer found a woman’s pocketbook which contained an assortment of tools.2 Officer Wharton estimated that the [1096]*1096opening of the garage was eight to ten feet from the rear door of the restaurant.
Officer Wharton called for the assistance of a canine unit, and Officer Donald L. Beach and his German shepherd police dog soon arrived on the scene. After announcing his presence and receiving no response, Officer Beach released the dog. The canine sleuth ran to the bag containing the liquor bottles, then down a stairway to the lounge in the basement, and finally towards the rear door. Hearing the noise from inside the establishment, Officer Waters positioned himself behind a wall in the alley so that he could see the basement doorway. According to Officer Waters, a man ran out of the open doorway. Officer Waters -grabbed the man, who turned out to be Reginald Brooks.
Officer Wharton eventually testified that the sweater which Brooks was wearing looked like3 the sweater which she had observed on the intruder when he was at the cigarette machine.4 The owner thought that Brooks was the man whom he had seen inside the restaurant, but was not sure enough to make a positive identification.
Brooks did not testify on his own behalf. His only witness was a Public Defender Service investigator who had examined the premises and prepared photographs and a diagram. The investigator testified, among other things, that the door to the basement of the restaurant is not visible from within the garage, and that a person standing in the front opening of the garage could not see someone running out of the basement doorway.
Brooks and Ms. Murphy were both arrested and charged as codefendants in the same indictment. The record before us does not disclose the disposition of the case against Ms. Murphy. In any event, Brooks was tried alone.
II
THE CONTROVERSY OVER THE AIDING AND ABETTING INSTRUCTION
The prosecution case was presented in its entirety on the theory that Brooks was the principal, rather than an aider or abettor. The prosecutor began his opening statement by telling the jury that
You will hear in this case evidence of how the man who sits before you today, Reginald Brooks, was caught in the act of burglarizing the Lincoln House Restaurant.
The government’s theory remained the same during closing argument:
The most important evidence is to consider what happened once Mr. Brooks got inside. What did he do? He went in and tried to steal the liquor bottles. He went in and he broke open this cigarette machine, left cigarettes and money all over the place. How do we know he had an intent to steal when he went in? That’s what he did when he went in.
The government's focus never changed during the presentation of the case. With the express consent of both counsel, the trial judge decided to instruct the jury before closing argument.5 He did so because
it is easier for you to make your arguments based on the instructions that the jury has already heard. It is much easier for the jury, having heard the instructions, then to follow your argument.
The judge thus correctly viewed it as especially important that both Brooks and the prosecutor be apprised of the content of the instructions before making their arguments. His determination that the instructions should be given first, was plainly designed to assure that this be effectively accomplished. Indeed, the purpose of Su[1097]*1097per.Ct.Crim.R. 30 is to “provide counsel with the opportunity to fashion their closing arguments according to the charges to be submitted to the jury.” Ballard v. United States, 430 A.2d 483, 487 (D.C.1981).
During the discussion of proposed jury instructions, the prosecutor requested the judge to include in his charge standardized jury instruction No. 4.02, which deals with aiding and abetting.6 CRIMINAL JURY Instructions FOR THE DISTRICT OF COLUMBIA No. 4.02 (3d ed. 1978). Brooks questioned whether there was any basis in the record for giving this instruction. In response to an inquiry by the judge, the prosecutor confirmed that, to use the judge’s words, “the theory would be that the jury could find Mr. Brooks guilty as having aided and abetted Ms. Murphy in these offenses.” The prosecutor pointed out that Ms. Murphy was found near the tools with which the rear door might have been dislodged, and argued as a “fair inference from the evidence” that Ms. Murphy “either herself broke open the door or helped somebody else break open the door or was perhaps holding the tools for the person that did break open the door.”
The judge responded that he could see how the evidence relating to Ms. Murphy might support an aiding and abetting instruction in her case if she were on trial; it was possible, in other words, that Ms. Murphy was aiding and abetting Brooks. Citing Payton v. United States, 305 A.2d 512, 513 (D.C.1973) (per curiam), however, he concluded that the evidence that there was a principal whom Brooks could have aided and abetted was vague and inconclusive. Relying on Payton, the judge declined to give the requested instruction, thus putting the parties on notice that the closing arguments would have to be fashioned on the premise that Brooks was accused of being the principal, rather than of assisting someone else to burglarize the property.
During closing argument, the prosecutor again focused on the government’s evidence that Brooks was a burglar who had been caught in the act. In response, Brooks, who had not testified and therefore could not be cross-examined, represented to the jury that he was never in the restaurant,7 and suggested that there could have been a “missing link suspect” who might have seen the owner, left the establishment through the back door, and escaped through the alley. In his rebuttal argument, the prosecutor responded, quite correctly, that there was “no evidence from the witness stand that there was yet a third person involved here in this burglary, apart from Mr. Brooks, who came running out, and apart from Ms. Murphy standing [1098]*1098in the back alley with the burglar tools in her pocketbook.”
That was where matters stood in relation to the dispute over an “aiding and abetting” instruction until the court heard, several days later, from another vital participant in the proceedings, namely the jury. Jury deliberations had begun on Friday, October 21,1983. At 4:50 p.m. on Tuesday, October 25, the jury sent the judge a note which read as follows:
If a person knows of a crime and is present during the crime and agrees with the commission of the crime, is that person guilty of a crime? Please clarify the law on these questions, particularly in reference to petit larceny.
The prosecutor immediately suggested that the judge respond to the request by now giving the jury instruction which the judge had previously rejected, namely, No. 4.02. The prosecutor argued that “the jury may have credited — that the jury may be wrestling with the suggestion that there was yet a third person involved in the burglary who escaped arrest.” He pointed out that Brooks
had argued something to the jury, or at least implied as much to the jury, that another person might have escaped from the restaurant and had hidden himself in the alleyway, or just run away, simply run away from the officers who were coming north from the alleyway, by himself running north through the alleyway.
Brooks objected to the instruction, contending that the prosecutor had relied on the theory that he was the principal rather than an aider and abettor of another person. The judge, however, now decided to give the aiding and abetting instruction, explaining his rationale as follows:
Well, I think that I have to distinguish the government’s theory in this case from the testimony of the witnesses that the government has presented. The government’s witnesses, in response to questions from you, Mr. Brooks, gave testimony concerning the possibility of a person other than you having hid in that area or made his way out through some other means.
While I think that is pretty thin, that is certainly what you relied on in your argument to the jury. I think that that theory of the case, even though the jury may doubt it, that theory is before them.
So, I am going to reverse the decision that I made earlier in denying this instruction. I am going to go ahead and give it to the jury now in response to their question.
The judge then directed that jurors be returned to the courtroom, and read them Instruction No. 4.02 on aiding and abetting. At approximately 11:00 a.m. on the following morning, after less than two hours of additional deliberation, the jury announced that it had reached a verdict, which turned out to be unfavorable to Brooks on all counts.
Ill
LEGAL DISCUSSION
A. The lack of evidentiary basis for the aiding and abetting instruction.
When the prosecutor initially requested an “aiding and abetting” instruction, the judge commented that in light of the evidence that Brooks was inside the restaurant, while Ms. Murphy was outside it near the tools that could have been used to accomplish the break-in, there would have been an evidentiary basis for regarding Ms. Murphy, but not Brooks, as an aider or abettor. We think that this was a correct assessment of the evidence insofar as it concerned the respective roles of the two individuals. We agree with Brooks that there was no evidentiary basis for an instruction predicated on the notion that Brooks was an aider and abettor and someone else the principal. As Brooks points out in his reply brief, “nothing in the record really indicates that Ms. Murphy was the principal brain or brawn of the attempt to burglarize the Lincoln [House] Restaurant.” Moreover, there is no basis in the record for the notion that Brooks was aiding or abetting an unknown third party.
The common law was burdened with obscure and technical distinctions between principals and accessories, and these refinements had the potential for derailing prose[1099]*1099cutions for reasons unrelated to the merits. “If the defendant were charged as a principal he could not be convicted upon proof that he was an accessory. Likewise, one charged only as an accessory could not be convicted if the evidence established that he was instead a principal.” 2 Wayne R. LaFave & Austin W. Scoot, Jr., Substantive Criminal Law, § 6.6, at 131 (1986). A great deal could depend on the skill and artistry of the pleader.
The statutory law of this jurisdiction, however, provides in pertinent part that “all persons advising, inciting, or conniving at the offense, or aiding or abetting the principal offender, shall be charged as principals and not as accessories.” D.C.Code § 22-105 (1989). Section 22-105 “extended [the] doctrine of vicarious responsibility to additional classes of offenders by treating them as principals.” Hazel v. United States, 353 A.2d 280, 283 n. 9 (D.C.1976); see Maxey v. United States, 30 App.D.C. 63, 72-73 (1907). Doctrinal distinctions have been supplanted by a more down-to-earth and practical approach.
Under § 22-105 and its federal counterpart, 18 U.S.C. § 2(a),
[c]riminal accountability does not depend inexorably upon personal performance of the acts comprising an offense. He who assists the perpetrator of crime in its commission is as much answerable as if he had engaged in all of its essential aspects himself.
United States v. Staten, 189 U.S.App.D.C. 100, 108, 581 F.2d 878, 886 (1978) (footnote omitted). The classic articulation of the aiding and abetting doctrine, written by Judge Learned Hand and subsequently adopted by the Supreme Court8 and by our own,9 teaches that in order to aid or abet another to commit a crime, it is necessary that a defendant “in some sort associate himself with the venture, that he participate in it as in something that he wishes to bring about, that he seek by his action to make it succeed.” United States v. Peoni, 100 F.2d 401, 402 (2d Cir.1938).
But “[w]hile a defendant may be charged and convicted as the principal even though the proof is that he was only an aider and abettor_, there must be evidence that someone other than defendant was the principal whom the defendant aided and abetted.” Payton, supra, 305 A.2d at 513 (citations omitted) (emphasis added); see also Gayden v. United States, 584 A.2d 578, 582 (D.C.1990), cert. denied, — U.S. -, 112 S.Ct. 137, 116 L.Ed.2d 104 (1991) (quoting Payton); Head v. United States, 451 A.2d 615, 626 (D.C.1982) (reversal may be required where an aiding and abetting instruction has been given if the evidence of the existence of a principal is vague). To be an aider and abettor, one must “aid or abet or procure someone else to commit a substantive of-fense_ One cannot aid or abet himself.” United States v. Martin, 747 F.2d 1404, 1407 (11th Cir.1985) (emphasis added). It is not essential that the principal in the operation be identified, but the prosecution is still required to establish that someone has that status. Gayden, supra, 584 A.2d at 582; Staten, supra, 189 U.S.App.D.C. at 109, 581 F.2d at 887.
Any impartial assessment of the record in this case compels the conclusion that the purported evidence that there was a principal in the burglary whom Brooks was assisting is not merely vague, cf. Head, supra, 451 A.2d at 626, but for all practical purposes non-existent. To conclude that Brooks was an aider or abettor, “the jury would have to engage in an irrational or bizarre reconstruction of the facts of the case.” Anderson v. United States, 490 A.2d 1127, 1130 (D.C.1985) (per curiam); see also Wood v. United States, 472 A.2d 408, 410 (D.C.1984).
As the judge correctly observed when first confronted with the issue under discussion, there was evidence from which one could reasonably infer that Ms. Murphy— the person outside the establishment near the tools — might have aided and abetted Brooks, who was allegedly seen inside the [1100]*1100restaurant and apprehended after fleeing from it to avoid apprehension. That the man who burglarized the premises may have had an accomplice, however, does not convert him into the aider or abettor; rather, it tends to identify him as the principal who was aided or abetted by another.10 Even if the trial judge had found Ms. Murphy to be the potential principal — and the judge did not11 — we could find no substantial basis in the record for sustaining such a ruling.
Nor is the aiding and abetting instruction supported by any questions Brooks asked of prosecution witnesses or by anything he said in closing argument. No prosecution witness saw or heard or knew of a “missing link” suspect or of any intruder other than Brooks himself. The judge instructed the jurors that “you may consider only the evidence properly admitted in the case,” including the “sworn testimony of the witnesses.” He also explained that “the statements and the arguments of counsel, including in this case, Mr. Brooks’, are not evidence.” Jurors are presumed to follow instructions, Coates v. United States, 558 A.2d 1148, 1150 (D.C.1989), and Brooks’ suggestion that there might have been a third party who burglarized the restaurant could not by some form of forensic alchemy convert non-evidence into evidence.
But even if Brooks’ statements as pro se counsel could be deemed in some way to have expanded the record12 — and we do not think they can — there still would be no evidentiary support for the notion that Brooks may have been an aider or abettor. The “missing link suspect” hypothesis must be predicated entirely on the assumption that the man who was seen in the restaurant was not Brooks but somebody else. But if that hypothesis is correct and the “missing link” suspect was the one who broke in, then there is no evidence whatever that Brooks aided and abetted him. The only evidence against Brooks is that he was identified as the burglar inside the restaurant and apprehended as he left it. If he was not the man inside, then there was simply no evidence of wrongdoing on his part. In other words, Brooks was either the principal or a non-participant. There is no evidentiary predicate for finding that he was an aider or abettor.
B. The timing of the instruction.
The lack of evidence to support the aiding and abetting instruction, which was alone sufficient to require reversal, was compounded by the timing of the judge’s decision to give it. The closing arguments had been completed several days earlier. If the instruction had been given in advance of the closing arguments, in conformity with the judge’s laudable aims de[1101]*1101scribed at pages 1096-1097, supra, then Brooks would have had the opportunity to invite the jury’s attention to the lack of evidence of any connection between Ms. Murphy and himself. There was no testimony that the two of them were even acquainted with one another. Brooks could also have pointed out to the jury, as we have noted in this opinion, that if the man in the restaurant was in fact someone other than Brooks, then there was nothing in the record to indicate that Brooks had given that man any assistance whatever.
The present case differs in this respect from Tyler v. United States, 495 A.2d 1180, 1183 (D.C.1985), on which the government places heavy reliance. In Tyler, this court sustained a trial court finding that the defendant’s closing argument would not have been different even if the aiding and abetting instruction had been made expressly applicable to the burglary charge13 before the jury began its deliberations, rather than as a reinstruction in response to a jury note. Here, for the reasons stated, the closing arguments might well have been substantially different if the judge had advised the parties in advance that he would instruct the jury on aiding and abetting.
The government points out that Brooks, like the defendant in Tyler, did not specifically request the opportunity to make further jury argument. See Tyler, supra, 495 A.2d at 1183. This observation is correct, although we note that the proceedings after the judge had decided to give the belated instruction were quite abbreviated,14 and it might have been difficult even for an experienced attorney, in reacting to these unusual denouements, to remember “on the spot” to request an opportunity to argue further. In any event, we do not predicate our decision on the judge’s failure to permit the parties to reopen their closing arguments (which he was not asked to do), but simply note that the prejudicial effect of the instructional error might have been alleviated by further jury argument on the issue of aiding and abetting.15
C. Harmless error analysis.
By giving the aiding and abetting instruction in this case, the judge communicated to the jurors that, even if they did not credit the prosecution testimony that Brooks was the man inside the restaurant, they could nevertheless find him guilty as charged. Instruction No. 4.02, as we have noted, begins with the admonition that
[y]ou may find the defendant guilty of the crime[s] charged in the indictment without finding that he personally committed each of the acts constituting the offense[s] or that he was personally present at the commission of the offense[s].
(Emphasis added). In the context of the present record, this meant that Brooks could be convicted even if the jury believed that he did not enter the premises, that someone else did, and that his presence in the area assisted the unknown principal in some other unspecified way. Since there was no evidence that Brooks did anything unlawful other than breaking into the restaurant in order to burglarize it, and since that evidence would make him a principal rather than an aider or abettor, we cannot conclude that the error was harmless.
It is well settled that instructional error is subject to harmless error analysis. Ty[1102]*1102ler, supra, 495 A.2d at 1183; see also Arizona v. Fulminante, — U.S. -, -, 111 S.Ct. 1246, 1263, 113 L.Ed.2d 302 (1991); Clemons v. Mississippi, 494 U.S. 738, —, 110 S.Ct. 1441, 1450-51, 108 L.Ed.2d 725 (1990); Pope v. Illinois, 481 U.S. 497, 501-04, 107 S.Ct. 1918, 1921-23, 95 L.Ed.2d 439 (1987). To conclude that the error in this case was harmless, however, we must be satisfied “with fair assurance, after pondering all that happened without stripping the erroneous action from the whole, that the judgment was not substantially swayed by the error.” Kotteakos v. United States, 328 U.S. 750, 765, 66 S.Ct. 1239, 1248, 90 L.Ed. 1557 (1946) (emphasis added); Jones v. United States, 555 A.2d 1024, 1028 (D.C.1989).16 We must focus on “whether the untainted proof is so overwhelming that it fairly may be said that the same verdict would have been reached absent the [erroneous instruction].” Brooks v. United States, 367 A.2d 1297, 1309 (D.C.1976). “The infusion of ‘harmlessness’ into error must be the exception, and the doctrine must be sparingly employed.” Clark v. United States, 593 A.2d 186, 192 (D.C.1991) (quoting Chapman v. United States, 547 F.2d 1240, 1250 (5th Cir.) (per Irving Goldberg, J.), cert. denied, 431 U.S. 908, 97 S.Ct. 1705, 52 L.Ed.2d 393 (1977)). Harmless error analysis should not be restricted to a superficial inquiry as to whether the same verdict would have been possible if the error had not been made. See Brooks, supra, 367 A.2d at 1309 (emphasis added); see also Clark, supra, 593 A.2d at 192. Rather, we must determine whether the error was sufficiently insignificant to give us fair assurance that the judgment was not substantially swayed by it. Kotteakos, supra, 328 U.S. at 765, 66 S.Ct. at 1248.
In determining whether the error was harmless, we consider the closeness of the case, the centrality of the issue affected by the error, and any steps taken to mitigate the effects of the error. Clark, supra, 593 A.2d at 192-93; Gaither v. United States, 134 U.S.App.D.C. 154, 172, 413 F.2d 1061, 1079 (1969). The prosecutor unquestionably presented a substantial amount of evidence, although the strength of his case did depend on the credibility of Officers Wharton and Waters, both of whom were at least marginally impeached.17 Since the aiding and abetting instruction permitted the jury to convict Brooks even if he was never in the restaurant, the error undercut the assumption on which his defense was predicated, and thus affected a very significant issue.18 Finally, no remedial steps were taken, for there was no further closing argument at which Brooks could attempt to refute the aiding and abetting theory. We therefore conclude that the error was prejudicial, not harmless.19
[1103]*1103IV
CONCLUSION
For the foregoing reasons, the judgment of the trial court is reversed, and the case is remanded for further proceedings consistent with this opinion.
So ordered.