If my neighbor kicked in my front door, shot my dog, and is trying to breach my bedroom door after repeated warnings from me-he dies in place.
LEO? ditto (I can't imagine a lion breaking into my house, but what the heck).
My children? I wouldn't have abandoned them in the first place, they would be with me.
Lets recap. Your front door is breached, your dog is shot, your bedroom door is being forced. Its time to shoot. Why wait for the bad guy to make it through the door, and possibly shoot you? Rule 4? Not in this case.