Under NCAA and NFHS rules, goaltending is defined as hitting the ball during a try when it's on the way down. It's legal to hit the ball on the way up. Iow, after the ball hits the backboard on a shot, you have to judge whether any subsequent touching occurred when the ball was still going up or after it started to come down. Going up = legal and going down = goaltending.
Under NBA rules though, it is is goaltending to touch the ball after it touches the backboard.
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