From the NCAA rulebook, 9-1 A.R. 2:
The ball is at the disposal of free-thrower A1. B1, within the visual field of A1, (a) raises the arms above the head, or (b) after the arms have been extended above the head, alternately opens and closes both hands. RULING: When the official judges the act in either (a) or (b) to be disconcerting, the official shall assess a penalty. The burden not to disconcert shall be that of the free-throwerÂ’s opponents.
Hope that helps!
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