The officials are responsible for ensuring the bottom two spots are filled by the defense. IMO, once the shooter has the ball, that responsibility is completed.
If A moved first, you could penalize only this act and not B's movement. Result: delayed FT violation.
If B moved out of his spot first, which A should do to be 100% sneaky, you might have to use the arrow. I find it unlikely that we can read the mind of the A player, to maybe rule this act was deliberate.
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Pope Francis
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