A Father Physically Assaulted A Referee During His Son’s Match Because His Son Was Losing

USA

If you look the kid in white has a hold of the other kid's right calf and his leg is turned sideways and forward underneath him. 

The ref blew the whistle and made a call known as "potentially dangerous hold" which was 100% right because the kid in the red and black's knee was being twisted in a way no knee should twist and could easily have been broken.