If I'm safe, I'll call 911 first.  If my life is at risk or my wife's, I'll defend my wife and I then call 911.  Doesn't make sense to get on the phone, let an intruder know you know he's in the house, rather than stop the threat. If he is armed, intends to rape or kill us, I'd rather have the element of surprise.  It's our home. He's violating the law, our safety and security.  If in a public place with an active shooter, run, hide, fight.  If in my home, the first two options are most likely not going to be considered for long.