I agree with this. If you weren't there to witness the whole event as well be extremely careful. I can imagine a scenario where you could shoot someone who appeared to be committing a deadly assault only to later learn that they were the victim, were defending themselves, but just happened to be winning the fight when you came upon the scene.Stand by for either link to , or posting of the Maryland Uniform Jury Instructions for this .
Short Answer is yes , with similar fine print as self defense .
Real world - You presumably know what's what with your Family . But a random 3rd Party is frequently not readily apparent what's actually happening , who's who , who's actually the bad guy or good guy .
If it's not a blatantly obvious Terrorism , or Active Mass Murderer , caution is usually wisest .