To add to Mick's great explanation, there could be illegal contact. The rebounding player moved into and displaced the player, while going in the vertical space of the opponent that would be a pushing foul.
If the opponent jump up vertically and made contact with the arms that would be an illegal use of hands, or a block.
Some officials will use the verbalization of "over the back" as a catch all to these situations. It isn't approved as a mechanic in NFHS, but it is used unfortunately.
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