Quote:
Originally Posted by waltjp
B may ward off a potential blocker. It's interpreted to mean that once a receiver gains the same yard line as the defender the receiver is no longer a threat to block and can not be contacted by the defender.
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Also if A is moving away from B then B cannot block A as A is not a potential blocker. You can still have a foul for illegal use of hands even if A never gets even/past B.