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I don't mean to be rude, but I just don't like this. I think your read is way off, and folding the AQs was just a disaster. I would 3bet it here, or at least call and see the flop. Your flush strength plus your high card strength is very, very nice. What could you be afraid of here?

Granted, the "maniac" has some very loose calling requirements preflop, but I don't see him making very many, or any for that matter, mistakes post-flop. Your read on him being a maniac is just not jusified IMO.

As far as the hand in question, there are two over cards to your pocket pair, one paired on the river, and all of the hands I've seen the "maniac" in, he's had a pair at least. Call, but expect to be shown a better hand. That's my opinion. I'd like to know what others think as well, because I'm very far away from being an expert.