If he had a four I would have crashed and burned. Maybe I'm wrong to think this way, and I probably am, but heads up, he would need one of two fours or called a preflop raise with 3-5 to beat me. I feel that heads up, with aces, it's a risk worth taking. They said I had gotten away with a few big bluffs before. It could be this guy is taking his turn and I have a decent hand to catch him with. Either way, I bet he was just holding a 6.