Last year when DD was in 8U a parent and an AC with her team got into a shoving match after a game. The AC was someone DD adores, and while he didn't shove first he was definitely an instigator.
The fight was over something stupid, and in full view of all of the kids. After that, I could see that DD was a little scared of the AC. She had never seen a physical fight up close before, and it took months before she could even talk to that AC again.
I can't imagine how much worse it would have been for a child to see a parent in that situation. Those poor girls.