I would say that if the ball is still above the rim when B1 steps in, A1 gets another attempt with resumtion of play. A1's shot, could (devine intervention) still hit the rim, don't guess! If A1's shot has passed the rim and B1 enters the lane then A1 has violated and B gets ball OOB.
4-20-3 The free throw ends when the try is successful, when it is certain the try will not be successful, when the try touches the floor or any player, or when the ball becomes dead.
I'd call violation on B1, shooting again. (Double violations are a pain, avoid them if you can)
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