You don't know why you hate it? Or is it you don't know why he does it?
Yes it is distracting to see Tony's arm waving back and forth while you're trying to see how his ball is tracking on the lane. But that's bowling, there are going to be distractions, both pleasant and not so pleasant. Deal with it.
Why does he do it? I can't say for sure but he is not deliberately swinging it. He is just not using his muscles to stop the free pendulum motion of his arm.
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