Rule 4-19, the definition of a foul:
Quote:
Originally Posted by rule 4-19, in part
A personal foul is a player foul which involves illegal contact with an opponent while the ball is live, which hinders an opponent from performing normal defensive and offensive movements....
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Combine that with rule 4-27-3:
Quote:
Originally Posted by rule 4-27-3
Similarly, contact which does not hinder the opponent from participating in normal defensive or offensive movements should be considered incidental.
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Protecting the airborne shooter does not imply you have to call a foul every time there is contact. Often times in the post there is contact which has no affect on the shooter, especially in the post.