What is the test for liability under the natural and probable consequences doctrine?

"A person who knowingly aids and abets criminal conduct is guilty of not only the intended crime [target offense] but also of any other crime the perpetrator actually commits [nontarget offense] that is a natural and probable consequence of the intended crime. The latter question is not whether the aider and abettor actually foresaw the additional crime, but whether, judged objectively, it was reasonably foreseeable. [Citation.]" (People v. Mendoza (1998) 18 Cal.4th 1114, 1133.) Liability under the natural and probable consequences doctrine "is measured by whether a reasonable person in the defendant's position would have or should have known that the charged offense was a reasonably foreseeable consequence of the act aided and abetted." (People v. Nguyen (1993) 21 Cal.App.4th 518, 535.)