1/2 NL Hand with KK

[spoohunter]

I have $600 behind. It's $100 buy in table. Villian just sat down, has $100 exactly.

I'm in the SB, villian makes it $10, one caller to me, I make it $40. He calls, heads up to the flop with $90-$100 in the pot.

Flop comes down A84.
I check.