As someone who does almost an equal amount of Pro-AM to HS/NCAA games, I can tell you that while you may be assuming they are similar, the rule is significantly different in that the gather is NOT the beginning of the habitual motion as defined under NCAA/NFHS -- I do agree that with a patient whistle you can allow the player to get INTO his habitual motion... but make sure you understand they are different (sometimes by maybe a second at most - but an important distinction)
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