Also, there can be contact created by the player from behind. But that doesn't mean it's a foul. If both players go up within their vertical plane, the contact is considered incidental. As has been stated above, if the player from behind displces the player in front, it's simply a push. Even if there is a slight push, most veteran officials will ignore it if the player in front is still able to rebound the ball. And, as mick stated, simply reaching above an opponent to rebound the ball is not a foul.
Illegal contact can also be created by the player in the front. Many times, he'll jump back into his opponent, who is going up within his vertical plane. Yet, fans and coaches will yell for a foul on the player from behind.
Bottom line, contact from behind doesn't mean there's a foul, and there's no such animal as "over the back."
Hope we've helped you!
