1
I am guessing that this is after all the walk toward Z and walking away from Z and following etc?
2 Coming out of the blue the way this is written, it makes me wonder just when Z had time to call 911? The way this is written, without the context then yeah Z sounds justified. But when you consider Z stalked him for a while, then approached him. TM probably thought he was about to be robbed. In his mind, he was probably defending himself.
I keep thinking of LE. LE are the people charged with public safety, and LE is required and trained to wait until they see a weapon before discharging their firearm. But Z expects something different?
Z is an LE wanna be. He doesn't want to work for it by taking the training, but he wants to be LE. He saw this kid in the neighborhood, and maybe it really did cross his mind that maybe he was looking for a home to break into. Z probably had a fantasy that he would "save" the neighborhood and everyone would praise him. He looked at the kid and saw he was younger and skinnier and thought he could take him. Or at least could hold him till LE got there to take custody and to shower him with praise.
But reality is a shock. When the kid he 'apprehended' was tougher than he was he got scared. And that is why he shot the gun. I guess being an LE is tougher than it looks.