There you go again defending a common criminal.He was in the house to steal, that by definition is robbing. You claim it was a prank then claim you are not defending a common criminal. Theft is NOT a prank, further the little monster had done it twice before.
He wasn't in the house; he was in the garage. If it were me, I would lock the door from the house to the garage, make sure my family was in a safe room far from the garage, and call the police. The homeowner, however, did not do that.
He lay in wait for the person who entered his garage and shot at him, in the dark, not seeing who it was or what they were doing, not even firing a warning shot or shouting a warning to get out. One time there was a bum digging through my garbage can. I didn't go out and shoot him (didn't have a gun but wouldn't have if I did). I had a big dog. I shouted at the bum from the window that I had a big dog and to get off my property. (I was a woman living alone and did not want a strange man on my property.) The warning was enough to make him leave. Had he not, I would have called the police. You don't just shoot someone and ask questions later: that's murder.