[Rich1]

This is a tough situation because the coach was trying to do a good thing and there may have been some room here for preventative officiating. But there is room for preventative coaching as well.

The coach has to know the rules and keep his players from leaving and entering the court when they shouldn't. Maybe bring the player over to the sideline to chew on him while he stands on the court, then send in the sub when beckoned, and chew him out some more on the bench.

As a former coach I know mistakes happen and have been in your situation before. But now that its done all you can do is take this as a good opportunity to teach the players about appropriate behavior and proper sub procedures so it doesn't happen in a big game.