What is the test for pinpointing a defense theory of the case?

Under appropriate circumstances, "a trial court may be required to give a requested jury instruction that pinpoints a defense theory of the case by, among other things, relating the reasonable doubt standard of proof to particular elements of the crime charged. [Citations.] But a trial court need not give a pinpoint instruction if it is argumentative [citation], merely duplicates other instructions [citation], or is not supported by substantial evidence [citation]." (People v. Bolden, supra, 29 Cal.4th at p. 558, 127 Cal.Rptr.2d 802, 58 P.3d 931.)