NCAA rules:
Continue with the lane filled if there's been no change of possession. Otherwise shoot the FT(s) with the lane cleared and continue from PoI. This is Rule 2-11.4.
So if A1 is fouled and does not get a merited FT and the error is identified within the proper time, continue with the lane filled if only A has had possession since the foul.
Seems simple enough to me. What's the subtlety that you're thinking of?
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