In what circumstances will a prosecution be required to provide instructions on the "natural and probable consequences" rule in an assault case?

In People v. Prettyman (1996) 14 Cal.4th 248, 58 Cal.Rptr.2d 827, 926 P.2d 1013, we held that instructions on the "natural and probable consequences" rule are required only when the prosecution has elected to rely on that theory of accomplice liability, and then, only when substantial evidence supports the theory. When the instruction is given, however, it should identify and define any target offenses allegedly aided and abetted by the defendant. (Id, at pp. 268-269, 58 Cal. Rptr.2d 827, 926 P.2d 1013.)