My rule of thumb is that it's a violation if the elbows rotate faster than the body. Guess what, it's even supported by a rule.
4-24-8a
It is not legal to swing arms and elbows excessively. This occurs when arms and elbows are swung about while using the shoulders as pivots, and the speed of the extended arms and elbows is in excess of the rest of the body as it rotates on the hips or on the pivot foot.
I've only made this call a couple of times.
Z
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