If player B's move was a legitimate attempt to block the shot, you have nothing and play on. If, however, in you judgment, player B was simply slapping the board to rattle the ball, did it for showmanship, did it out of frustration, etc., "T" 'em up. As I said before, if he was legitimately trying to block the shot and the follow through of that attempt struck the board or he simply missed the ball in the attempt, play on. The purpose of the rule, IMHO, is to penalize intentional contact with the backboard while a try is involved or placing a hand on the backboard to gain an advantage.
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