General Discussion

No class will train you for that.

I've unfortunately been in this situation myself, I'm hopeful I'm not a sociopath.

As an infantry soldier, I was military trained to use the firearm that I used to defend myself.

You follow your training, no one is ever trained to fire at legs...it makes no sense because if you have no idea what your opponent has for a weapon you fire at center mass the largest target possible that way if you miss vertically or horizontally there is still a good chance you will hit something on the target periphery.

You are awakened from a sound sleep, you retrieve your weapon and you announce that you are armed the attacker says he will take your weapon from you and end you and everyone in the house. It's dark and you have no idea what they have or do not have for a weapon. You fire two shots at center mass and the third at the head, then you search every inch of your home to make sure he was alone. Less than 10 seconds has passed during this encounter. Your life and someone else's has been changed forever. No one wishes for that, but it's a better outcome than you and your family being killed so someone can take your stuff and sell it for drugs or profit or whatever.