There seems to be a difference between the way the rule and the interpretation is written. In 9-2-3-a, the rule talks about not contacting a receiver who is no longer a POTENTIAL blocker. Case 9.2.3.A say if the receiver is not ATTEMPTING to block, it is illegal.
It seems to me a person can be a potential blocker without attempting to block by being is position between the defender and the runner.
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