9 SNG $5 + .50 End 4th 79 Hands

Mixed play but overall ok. Last hand  I had pocket 6's on the BTN, short stack, went all-in. Ended up against pocket A's. No hits for either of us, I lost.

Hand 19 early on I didn't understand. I had 8c 5c on the BTN. Action folded to me and I tried a blind steal by open raising 3 BB (150), SB called and BB folded. Flop Kc 4c 2s. I have a flush draw. SB bets 225 into the 350 pot and I decide to re-raise them to 450 to see if they are serious. That leaves me w/680 chips. They re-raise me to 750. Shoot. Well, I decide to go for it and hope for the flush and that the SB doesn't have any clubs, and re-raise all-in w/my last 680 chips. I expect to be called and likely lose based on their strong betting so far. Instead they fold and I win! Did they hit the wrong button?  If not, Why did they fold? What in my betting and the visible cards scared them away?

Full Tilt No-Limit Hold'em, 5.5 Tournament, 25/50 Blinds (9 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

saw flop | saw showdown

SB (t1740)
BB (t1005)
UTG (t835)
UTG+1 (t1395)
MP1 (t1685)
MP2 (t2220)
MP3 (t1830)
CO (t1510)
Hero (Button) (t1280)

Hero's M: 17.07

Preflop: Hero is Button with 8, 5
6 folds, Hero bets t150, SB calls t125, 1 fold

Flop: (t350) K, 4, 2 (2 players)
SB bets t225, Hero raises to t450, SB raises to t750, Hero raises to t1130 (All-In), 1 fold

Total pot: t1850
Main pot: t1850 returned to Hero

Results:
Hero didn't show 8, 5.
Outcome: Hero won t1850