Bob,
I was reading the exact opposite from the comment - i.e. that they would balk the move if the pitcher did not keep his pivot foot "motionless", toes pointing to 3B. That is, they would balk the (RH) pitcher fot "pivoting" (i.e. "turning") on his "pivot foot" in a pickoff to 1B.
Now I do agree that that would be a very difficult move - probably more likely to tear up your knee than break your ankle.
But I certainly don't think the rule proscribes such a pivot.
JM
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