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You're working under the premise that the referee's problem was skill or training, Bilbo.
Skill / training / "accuracy" had nothing to do with THAT call. The referee was well aware that he saw no U.S. foul. He called a foul for some reason other than what happened on the play. That is a given.
If there were ANY possibility that he thought he saw something and just lacked training or skill, it's a different conversation. But there was NO "plausible deniability" on THAT play.