if the jury believed Marshall was killed by the defendants during the perpetration of robbery, the only verdict which could be returned was that of first degree murder. (People v. Perkins, 8 Cal.2d 502 [66 P.2d 631]; Pen. Code, § 189.) It is, therefore, evident that if instructions on second degree murder or manslaughter were warranted, they must be grounded upon evidence which was presented by the defendants, or by such evidence together with that of the prosecution.
By its limited instructions the trial court imposed upon the jury with respect to Jeter the burden of accepting either the prosecution’s theory that Marshall’s death occured during the commission of a robbery, or the defense that Jeter had acted to protect his person. But the jury had other alternatives. If, for instance, it believed Jeter’s testimony that he and Marshall first scuffled but did not believe Jeter’s further testimony that he fired only after Marshall had drawn and fired, or if it believed that Jeter took advantage of Marshall’s allegedly drunken state after entering into the scuffle, it assuredly could not have brought in a verdict of self-defense, nor would it have been required to bring in a verdict of first degree murder. The crime, if any, could have been second degree murder if the jury found that Jeter fired the first shot with malice aforethought but without wilfulness, deliberation, or premeditation (Pen. Code, § 189; People v. Thomas, 25 Cal.2d 880, 903-904 [156 P.2d 7]), or it could have been manslaughter if the jury found that the shooting was done without malice upon a sudden quarrel or in the heat of passion. (Pen. Code, § 192; People v. Best, 13 Cal.App.2d 606, 609-610 [57 P.2d 168]; Stevenson v. United States, 162 U.S. 313, 314-316 [16 S.Ct. 839, 40 L.Ed. 980, 981].)
The Supreme Court in Stevenson, supra, stated at page 314 [40 L.Ed. at p. 981]: “It is difficult to think of a case of killing by shooting, where both men were armed and both in readiness to shoot, and when both did shoot, that the question would not arise for the jury to answer, whether the killing was murder or manslaughter, or a pure act of self-defense. The evidence might appear to the court to be simply overwhelming to show that the killing was in fact murder and not manslaughter, or an act performed in self-defense, and yet, so long as there was some evidence relevant to the issue of manslaughter, the credibility and force of such evidence must be for the jury, and cannot be a matter of law for the