Ejected coach doesn't leave immediately

[SC Official]

In a high school game you will likely have administrators and/or security who will get the coach out of there. In the unlikely event they don't do their job and the coach doesn't leave on his own, suspend the game and let your state take it from there.

Non-scholastic game, all bets are off. Yes, I am exponentially more likely to declare a forfeit. No TD or security? I'm with Raymond; set the timer for a minute, and if he's still there then declare a forfeit, grab your bags and GTHO. Those games aren't worth the headache. If your assigner, etc. doesn't defend you, then it's probably time to move on.

Don't stick around getting treated like dirt "so the kids don't get penalized." The "kids" and their parents have no one to blame but the coach.