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[Dutch Alex]

So you've had a problem-coach who doesn't no the diff. between OBS and INT. Nor that he knows how to talk to an umpire?
In first case imo you've done right; giving a warning.
In second case ingoring him might influence the game, but talking to him is giving in to him. I think I would talk to the team-captain, not with the coach... But when both cases were in one game, he was gone!