KK..A comes on flop

Didn't really have much on villian. We were 11 hands into a SnG. At first I thought I played this well and was kinda proud I was able to make this laydwon. Now I just wonder should I have tested him to see if he was making a move? Just curious as to what ya'll think???

Full Tilt No-Limit Hold'em, 1+0.25 Tournament, 25/50 Blinds (7 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

BB (t1490)
Hero (UTG) (t1635)
MP1 (t4555)
MP2 (t1305)
CO (t1420)
Button (t1220)
SB (t1875)

Hero's M: 21.80

Preflop: Hero is UTG with K, K
Hero raises to t225, 3 folds, Button calls t225, SB calls t200, 1 fold

Flop: (t725) 7, 2, A (3 players)
SB bets t550, Hero folds, 1 fold

Total pot: t725

Euch, nasty spot but I think at the end of the day I'd do the same. Be interested if any of the more experienced regs would play it differently.

In a tournament you definitely have to fold this. You don't have enough chips to test him and be wrong.

The button just commited his stack here, and you only have him coverd by 400. I'm laying this down and looking for a better opportunity.

lol ew spot, but looks like a pretty easy laydown

foldy moldy.
...nd frown.

I like this fold here. I would think the SB has a high non-suited ace [AK ff, AQ off] and is trying to protect top pair from the flush with two players behind him.