"Administrative leave"

Minnesota media is reporting he was fired!
I am trying to figure out why he was fired as a coach (he doesn't teach, he just helps coach wrestling) for his statements in the context of having just winning a professional fight. In the context of the fight arena, a legal and professional sport, he called out a person he had political and philosophical differences to face him in a sanctioned fight. However, school teachers can call elected officials names and express all kinds of dreams and wishes in the classroom, and it is protected by tenure, freedom of speech and healthy debate.
This guy has a huge court settlement coming his way if the ACLU would be willing to cross party lines and show that they are for the Rights of all men and women and not just the left side.
By the way, I do not even give the Secret Service a pass on this one. I understand that they need to follow up on all threats, but how is a fighter shouting a challenge a threat?