It's a good thing Big Boy didn't finish him. He did precisely enough to get his point across without getting himself in trouble. I enjoyed seeing that little girl get his arse slammed, but the kid who was bullied came dangerously close to manslaughter. If he had carried the bully 3ft more in the direction he was headed, he would have slammed the runt into that retaining wall. If runt had hit his face on the corner of the wall and died, the big kid defending himself would have been scarred for life by the act and the legal troubles he would have faced. Yes the runt punched him twice, but he was 3 times the runts size.
Good for him for defending himself, but it was a close call when he slammed that kid the way he did.