And this is a reason I think it's important to have a license for CCW. Yes, I understand this was a home invasion and not CCW, but this homeowner should know better. It's important for anyone that wants to defend themselves with a firearm that you can only defend yourself with lethal force when there is a threat on your life or somebody else's. Once the threat stops you can no longer use lethal force. Could be a guy running away, or could be you shot the guy twice and he was out of the fight. My point being that there is more to self defense than just knowing how to shoot your weapon. It's also about understanding that your actions have consequences, and some can be bad for the defender.
I understand what the home owner did in this case, and honestly, I might do the exact same thing. It's easy to be an armchair lawyer. Never know what a person would do when it's your own home/life/family and the adrenaline gets pumping.