Top Two Check raised on river all in...

[Chillum]

PokerStars No-Limit Hold'em, $4 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($1994.55)
UTG ($382)
MP ($178.60)
CO ($470)
Hero ($688)
SB ($321.10)

Preflop: Hero is Button with K[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/heart.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to $16</font>, SB calls $14, BB calls $12.

Flop: ($48) 3[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">BB bets $34</font>, Hero calls $34, SB folds.

Turn: ($116) J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $80</font>, BB calls $80.

River: ($276) K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $200</font>, <font color="#CC3333">BB raises to $1864.55</font>, Hero ???

Its 358 for me to call. Villian is redargoe, who i have as 20/17/4 over 500 hands. What the hell can he have there? The only thing I feel like he could be doing with this is like Q10dd or like a bluff. Any input?