I noted this in a post yesterday that was started by a gator and subsequently was deleted.
Much more complicated than some drunk sore loser.
The band (who was being as obnoxious as everyone else there) filed out right in front of people trying to leave and blocked their exit.
Lady got loud and tried to continue to exit, band members yelled back at her and blocked her. Band director put his hands on the lady who was trying to leave to keep her from walking through the band, getting very much in her face to yell at her.
Some guy, probably with her, then grabbed the band director from behind, yanked him off her, and threw said band director to the ground (really, not even as violent as that). Happened very fast, and by the time the cop - who was just on the other side of the band - showed up it was pretty much over.
Some other girl - not part of the scuffle but possibly in the vicinity - apparently got a nose bleed because she had a panic attack courtesy of crappy stadium management in figuring out how to shuffle massive amounts of people out.
That's it. Actually that's not complicated at all. If band director wants to lay hands on people trying to be a tough guy, he should not be surprised by certain repercussions.