Here's a video of an AAU basketball game in Oakland where a man from the stands watching punches a player on the court. It doesn't seem like anyone can confirm if the attacker was a fan or a coach.
The game was between the Oakland Soldiers and the Oakland Rebels. The Soldiers are one of the top AAU teams in the country. This was a match-up of teenagers and the community is now up in arms due to an adult punching a minor.