Unlike some in this conversation, i have taken rudimentary and some not so rudimentary gun classes. And in all the classes, the instructor instructs to shoot until the threat is neutralized, That doesn’t mean shoot once and then check, it means shoot until you are certain that the threat is neutralized. Now I’m sure that you have taken these classes as well, and from the way you are talking it seems like you may be an expert. As an expert you should be held to a higher standard, as a citizen with a gun, he was well within what a citizen with a gun is taught.