109r-- River Decision against Brynkenney

[ZJ123]

Well i just got moved to this table, and Bryn 3 bets lighther than anyone, so thats my only read. His line is really wierd here, and it looked a lot like AcXc, maybe Kcxc, not sure, but his river bet looks real fishy, thoughts on all streets?

PokerStars No-Limit Hold'em Tourney, Big Blind is t150 (8 handed) internettexasholdem.com

SB (t16560)
BB (t6385)
UTG (t5100)
UTG+1 (t19953)
MP1 (t13115)
Hero (t12313)
CO (t18360)
Button (t4960)

Preflop: Hero is MP2 with 7[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/club.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to t400</font>, <font color="#CC3333">CO raises to t1111</font>, <font color="#666666">3 folds</font>, Hero calls t711.

Flop: (t2447) 9[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, CO checks.

Turn: (t2447) 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t1234</font>, CO calls t1234.

River: (t4915) K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets t3940</font>, Hero