He eliminated the threat. That I can agree with. Training says shot center of mass until the threat is gone.
Unlike you and all your upvoters, I’m glad the shit bag is still alive.
I’m glad the real victim didn’t so something stupid (but maybe understandable in a high-enough threat posture) of shooting again; that would have made his defense much more difficult.
One shot was all that was needed. Heck even if he had missed, that would likely have been all that was needed since I assume (a risk I know) fuck bag prankster has at least enough self-preservation brain cells to un-ass from the scene once the loud bangs start to happen.