In lower level games - youth league, competitive youth tournaments and the like - I have had head coaches and assistants yell "BOX OUT" just as the shooter is about to realease his or her try. I've stopped play for disconcertion by players for similar acts (well timed cough, shoe squeek, BOX OUT e.g.) maybe once or twice in the past 10 years, but never a coach. But, I've come close. Instead, I've gone to that coach to remind him of the rule and that has always nipped the issue in the bud.
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