[Flintoff]

But there are degrees of megatilt - lol.

I have no doubt both are winning players. A winning player's tilt is far different from a losing players.

Perhaps my thoughts that a good player makes a fold here is results orientated.
I still can't see what UTG could have though that I can beat.

The VERY WORST he has is AQ.

Now he knows I am a decent player and I am not 3 betting that turn without AQ at the very least. He also knows that the tilter (despite his tilt) is not a complete fool therefore has to have a queen or better.

Now he knows he has a queen himself so one of us has to have better. Yet he still raises that river.

The more I think about it, the more I think it was a fold.