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He probably has you beat but it is worth a call. My guess would be the flush with the initial raise an attempt at a free card - don't know if he is good enough to pull this move though.

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c/ring this to boot out UTG+1 with a flush draw is the most horrible play ever. He would have to be stupid to pull this move, not intelligent.

I would more than likely put UTG+1 on a flush draw than BB, however quite often bad players will c/r the flop with a flush draw when they don't know why they are doing so. He may also have flopped 2 pair hoping to c/r you on the river but this scare card may have let you check through.

I think he either has top pair or flopped 2 pair and I think you win far more than 12.75:1 lays you. He may also have had FD + pair...

Nice play sir