7.5/15 deep, really weird hand

[BalugaWhale]

Effective stacks of 4.2k
CO (pretty good TAG) raises, I call OTB w/ K[img]/images/graemlins/spade.gif[/img]4[img]/images/graemlins/spade.gif[/img], HU to the flop

6[img]/images/graemlins/heart.gif[/img]5[img]/images/graemlins/club.gif[/img]3[img]/images/graemlins/heart.gif[/img] (pot about 130)
he c-bets for pot, i raise to 400, he calls.

turn is the K[img]/images/graemlins/diamond.gif[/img]
he leads for 700 into a pot of about 950ish

call/push/fold?