Because of dissatisfaction with the referee in the previous round of his own offensive fouls, letter brothers heart has been holding a breath. After that, Wagner, who was opposite to him, had some conversations with him on the court. Maybe some of the contents made the letter brother more angry. He directly made the action of Wagner on his head.
Angry letter brother also received his due punishment, the referee ruled the action as a second level malicious foul, he was directly expelled.