Let the coach show you the rule book on the field?
If a coach approaches me about a call my partner makes I simply tell him, "You're talking to the wrong guy. _____(insert partners name) is approachable, go talk to him."
Also, IMO, I don't want a coach pulling out his rulebook on the field and showing me a rule. As an umpire, it is my job to know the rules. If he is adament that there is an interpretation problem, I get with my partner and the umpires discuss it ALONE. No coach is giving me a rules seminar on the field. But you must know the rules...
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