5/10 facing river c/r, WTF is this?

[tozzy]

Party Poker, $0.01/$0.01 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

MP: $1,414
Hero (CO): $995
BTN: $2,935.58
SB: $1,362.75
BB: $2,133
UTG: $812

Pre-Flop: A[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/club.gif[/img] dealt to Hero (CO)
2 folds, <font color="red">Hero raises to $35</font>, BTN folds, SB calls $30, BB folds

Flop: ($80) 5[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/spade.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $63</font>, SB calls $63

Turn: ($206) K[img]/images/graemlins/club.gif[/img] (2 Players)
SB checks, Hero checks

River: ($206) 9[img]/images/graemlins/diamond.gif[/img] (2 Players)
SB checks, <font color="red">Hero bets $161</font>, <font color="red">SB raises to $550</font>, Hero

Villain is 19/9/2.4 over a datamined sample. His river AF, however, is 3.5.
Seriously, what hand does he ever play this way?