Stan, if the rule wasn't in place, A could gain an advantage by throwing the ball off B's backboard. Let's say A1 is in his backboard dribbling and picks up his dribble. He's being pressured by B1 and can't make a pass. A1 throws the ball off B's backboard, catches it, and starts dribbling again. But with the rule, it's a double dribble as soon as he touches the rebounding ball.
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