Outlaw is dead on with his comments.
We were taught you shoot to eliminate the threat. (back in the 70's while in the Academy)
If the suspect is down and cannot shoot back at you, then you
eliminated the threat...
Let's say the suspect is down and the gun is 20 feet away, and you can safely take custody of the gun, so he or she cannot use it against you, then the threat has been eliminated...
Never say I intended to kill.
We were taught to say in court; I took these actions to eliminate the threat...No more, no less, just repeat this sentence every time you are asked if your needed to shoot the perp that many times or "is it true that the suspect hit you, and you wanted revenge; You wanted to kill him didn't you?"
"I took these actions to eliminate the threat" Sir!
You could also use I took these actions to stop the attack...
As others have said, "Center mass only"
Never try to be John Wayne and shoot the gun or knife out of there hand...Or knee cap them...
e·lim·i·nate [ih-lim-uh-neyt] Show IPA
verb (used with object), -nat·ed, -nat·ing.
1. to remove or get rid of, especially as being in some way undesirable: to eliminate risks; to eliminate hunger.