A: by rule, this is an illegal shift. Early in the game, I'd warn, then flag. If the QB motion causes B to encroach, I'll flag FS.
B: provided they do all this without hitting 25 seconds, deceiving B into thinking no snap is imminent, and A comes set before the snap, this is legal. There is no restriction on the QB after going under the snapper.
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Cheers,
mb
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