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A bit off topic but...
I never really understood the stop clock signal (open hand in air). What is the purpose? And if the response if "to stop the clock" well then what is the purpose of the whistle? The whistle is enough.
Furthermore, what is purpose of fist in air for fouls? I think, yes extreme minority I know, that there is no need for any hand/arm in the air at all. Just whistle, followed by mechanic and any necessary verbal info.
Is that a super ridiculous idea?
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If some rules are never enforced, then why do they exist? 
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