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I haven't read all the replys, but the way I understand the play is, looking at it from the side, B1 is straight up, with his arms back at like a one o'clock position (must be flexible!!). At some point, he moves his arms back to a 12:00 position either right when or right before A1 has a body part in that area.
If that's the correct situation, you've got nothing, unless B1 is fouled (which he probably won't be). He still has the right to verticality even if he isn't using it at the time the other player breaks his verticle plane.
Now, if he moves his BODY back, then moves back forward, he will likely be the one who initiates contact and should be called for a foul, if any.
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