And that, boys and girls, is where the problem started. Faced with the same situation, I would have dialed the guy up on the phone. If he wouldn't talk, I would have sent a couple of uniforms with good bulltproof vests (and their weapons in their holsters!) to staaple a summons to his door for disorderly conduct. Then, if I still thought that the guy might be likely to come out and cause trouble (even though there appears to be no real evidence of it) I'd post a couple of uniforms there in a squad car, and go grab something to eat. The dude's not going to stay in there for the rest of his life.
Never, never never should a guy burning furniture on a lawn have led to a situation where people were willing to use deadly force against him.
BTW, are you sure about those 1,200 rounds? Seems like a lot even for a cluster like this.
http://www.lubbockonline.com/stories/071401/loc_071401040.shtml