Incidentally, the official Neighborhood Watch manual says, and this is a direct quote: "it should be emphasized to members that they do not possess police powers, and they shall not carry weapons or pursue vehicles."
IMO
Hispanic guy follows the kid around, then approaches him in a hostile way and starts barking as the kid, probably flashing his piece, then puts his hand in his pocket, the kid freaks out and tries to defend himself and takes him down, guy grabs his gun and shoots him in the chest.
The black kid got trolled hard.
All he wanted was his ice tea and skittles and get back to his basketball game.
Love how it took the cops 3 days to identify him, especially when they had his cell phone and his contact info was at hand.
Pathetic.