I'm just saying in general. Not all people have training, but some do. The example I'm giving is "Guy A", who has some background in BJJ but has a torn rotator cuff. He is attacked for no reason and assaulted by "Guy B" where he threw "Guy A" to the cement sidewalk and mounted him, striking his head to the ground. Bare hands and smashing of a skull on a hard surface is definitely a lethal or serious bodily injury threat, but he doesn't think he will last long because of his preexisting injury, so he uses a firearm in lethal force self defense. Yes, I'm using the Newton incident to stage my example, but it's totally realistic as a scenario.