What was he doing that was bad? Walking to his father's home? He was a young kid, with nothing in his pockets but a bag of Skittles. He was being followed - at night - by an older armed man. I would imagine he was terrified. I would have been.

As for what proof I would expect to back up your statements, did he have an arrest record? Was he in a gang? Did he have drugs in his pocket? A knife? Those are things that I would classify as "thuggish". Walking home at night isn't.