Honestly, I had a little trouble following this hand because you have your As and Bs mixed up. The BB (B) should act before the button (A) in all betting rounds after the flop. I wasn't sure if you got the letters mixed up, or what. Can you edit your post so it's right? Maybe use "my friend" and "some other guy" instead of A and B.
Bizarre hand though. I dont' see why it would be illegal.
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