Honestly, the only way I can envision PU helping "unpull" the foot is if the BU positively saw the foot pull, but was straightlined when the fielder tried to reach that foot BACK toward the base, and needed help confirming whether she got her foot back in time (or at all).
But even there it's problematical, for all the reasons mentioned above.
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I was thinking of the immortal words of Socrates, who said, 'I drank what?'”
West Houston Mike
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