I think that one should defend life (their own or another's) and stop the threat.Kill him. No if's, and's, or but's. If you see him heading to your child's room, let's say after you have yelled for him to get out of your home, shoot him. Doesn't matter if you hit him in his back, side, or whatever. Heading for your child's room must be treated as a worse case scenario and you should act accordingly.
To say "kill him" gives fodder to the LEOs, DAs, and survivors to legally attack and damage you.
Every comment made online will, at least potentially, come back to haunt you in a court of law.
Personally, I don't want my loose-lips to sink my ship.