A youth football assistant coach ran up to a referee and slapped him so hard, it knocked the referee to the ground. It was all caught on video.Referee Andrew Keigans decided to call the game between the West Park Saints and the West Miramar Patriots after he claimed someone made a derogatory comment from the West Park sidelines.

Keigans started walking off the field while West Park coaches and parents protested his decision. That's when police say Saints assistant coach Dion Robinson ran up to Keigans and slapped him so hard that he fell down. Broward County Sheriff Al Lamberti said Robinson has a prior criminal record, which includes battery on a law enforcement officer, aggravated assault with a firearm and cocaine possession.

Take a look at the video.