Blind confrontation

[londomollari]

Villian is 53/25/2 over 70 ish. Not had a blind confrontation with him yet. Not seem him doing anything unusual OOP yet.

PokerStars 5/10 Hold'em (6 handed)
Preflop: Hero is BB with K[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/heart.gif[/img].
<font color="#666666">4 folds</font>, SB completes, <font color="#CC3333">Hero raises</font>, SB calls.

Flop: (4 SB) A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets</font>, Hero ?.

First time I've seen him donk bet, very confusing spot for me.
Turn and river plans as well please.