One of my partners WHACKED a HC the other night after the game ended too. The offending coach's team won by five.
The coach "doubled as a commentator" early in the game and after I got tired of hearing it a few times up and down the court, he got the ole stop sign and a verbal from me - "Coach, no more. I'll ref, you coach. We don't need the commentary." I informed my partners.
After the game ended and as we were leaving the court, my partner said the coach got abusive to him and he WHACKED him so he could report it to the league and our assignor.
End of the game doesn't give them a free shot!