[ChuckElias]

I think you did what you needed to do. Handle it on the court. I'm guessing this was not a regular season game, and this stuff sometimes happens. The "real" coach was there and saw the behavior. So hopefully, s/he will clean it up for the regular season. If there was anything beyond normal "basketball" bad behavior (in other words, if there were threats or punches thrown), then I would report that to whoever assigned you the game. If it was general complaining/cursing kind of thing, I would say you did your job and let it go. JMO, obviously.