Funny thing is I never even considered a flush. I put him on a high pocket pair or even 66/77 trying to draw to a full house. And then when he overbet the river I assumed he was trying to buy it.

After that hand I watched for about 50 and he was a very aggressive player, buying lots of pots by overbetting smaller stacks and raising with pretty much anything. Problem with players like that is that they are so unpredictable.