Short handed 40-80

[NYplayer]

I don't play short handed that much but the game was dying down a few players got up and we were left 4 handed. The SB has only been playing for 15 min so I'm not quite sure how he plays. He showed 53o when he stoll the blinds with a button raise but has showed down a good hand or two.

It is folded to the SB and he completes and I just check with Kh 8d. Who raises?
Flop: Kd 8h 2h
SB checks, I bet, he calls.
Turn: 7h (Kd 8h 2h)
SB checks, I bet, he raises. who calls who reraises?
I just called.
River Ts (7h Kd 8h 2h)
SB bets, who folds calls raises?