Defense-of-others, strictly speaking, is not the same as self-defense, but they're discussed in the same breath and generally legislated together, and usable in

Defense-of-others, strictly speaking, is not the same as self-defense, but they're discussed in the same breath and generally legislated together, and usable in the same circumstances. Thus references to one are generally read as encompassing both. You would indeed be justified in shooting the husband if you stumbled upon him choking her to death (in most jurisdictions), but not if you just expected it to happen eventually.