Bizarre pf spot vs Colson

[stevepa]

I was recently moved to colson's table and he has lots of chips (probably like 25kish at 100/200/25). We've only played one pot together where he defended vs my button open. Then he check called a Q high flop, turn went check check and he check called the A river with QJ. I mucked.

On to the hand. I've been opening a lot of pots and open KTo utg to 600 with about 9000 behind. Colson two to my left thinks a bit, looks at my stack and calls. If I had to guess I think he was considering reraising more than he was considering folding, but that's far from 100%. Anyways, folds to the big blind who pushes for 1625 total and I???