Revised 2.8.4 in New '18,19 Casebook

[BillyMac]

We have a very old, seldom used, tradition that the non-ruling official informs the coach that the player has been disqualified. It's based on the idea that if the same official both rules a disqualifying foul and informs the coach that this could add "fuel to the fire" and create a problem. I've seldom seen it used, and have never, ever used it myself.

I have this in my pregame:
Game management: If I call a fifth foul on a player, I’ll tell the coach, unless I think it’s going to be a problem.
If either of us warns a coach, or the bench, let’s let each other know about it. If one of us calls a technical foul
on a coach, the noncalling official will remind the coach that he must sit down.