backcourt violation possibility
The only time which I have found it advatageous to use the "brush" signal is if the ball came from my primary at L or C and was touched by the defense before going into the backcourt. I will give the signal so that the T (who has backcourt violation responsibility) can give a quick glance before shutting down the play thinking that a violation has occurred and save an overrule from something that happened that he should not have seen if he was doing his job properly. In this instance it is a communication tool to keep the flow of the game.
There is not a real good reason to give the signal for a tipped shot attempt while the ball is still live. If it goes out of bounds and help is needed by the calling official, then communication can be given.
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