My suggestion: forget about it.
Be responsible for the things you can control. Your assignor had this other guy on the game, so he is responsible for him...not you. If the coaches have a problem, they need to go to the assignor, not to you.
I am happy to help out less experienced officials, particularly in youth games. But I had an experience recently with a guy who just wasn't getting it. I realized then, that it is not my job to help him get better. He just didn't want to listen, didn't want to hear what I had to say. So I don't offer the help -- unless someone makes a point of asking for it.
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