deep 5-10 live hand in vegas

[Gary Stevenson]

game has been fairly loose/passive except for one swedish kid who has been continuously raising pf and trying to win every hand.
2 limpers to swede in the sb, he makes it $40 which isn't out of the ordinary for him. i have K[img]/images/graemlins/spade.gif[/img]K[img]/images/graemlins/heart.gif[/img] in the bb and make it $160. folds back to the swedish guy who makes it $440 pretty quickly. he started the hand with about $3.3k and i covered by a little.
thoughts at this point? i've never seen him 4bet to a RR pf which has only happened a few times. he's probably playing something like 45/30/3 fwiw. RR/call?

anyway, i called.
flop comes 10 [img]/images/graemlins/club.gif[/img]3 [img]/images/graemlins/club.gif[/img]4 [img]/images/graemlins/spade.gif[/img] (~$900)
(he has about 2.8k left)he bets $600 pretty quickly...um what now?