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I think the current language of NF 9.2.3.d; "A defensive player shall not (d) contact an eligible receiver who is no longer a potential blocker.", is perfectly clear, and places the primary decision factor exactly where it belongs, in the hands of the covering official who is observing the action.
There shouldn't be any confusion for the covering official about it being perfectly legal for B to run through A2, to make a play on the Runner (A1), or contact to A2 being a foul should he turn away from B, in any direction, including back towards the LOS, as long as the change in direction removes the threat of blocking.
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