Maybe it was a noise restriction (time based). I don’t know about your town’s high school football stadium, or the one in the story, but ours is right in a residential neighborhood. Sure, you have to expect noise from the game, but when it’s over, knock it off.
You are the one calling it a lawful order so I would like to see some evidence.
“Maybe it was a noise restriction”
And maybe it was “let us finish this last number” and the cop said “no... Right now because I said so or I am going to tase you!”.
Nowdays my theory is absolutely much more likely. Ever watch “Cops”?
This is impatience and lack of compromise and “I said right now! is standard authoritarian protocol.