NL50: 2 Pair facing Turn Raise on Str8 Board

[oakrdrzfan]

Villain has an AF of 0.2 over 100 hands. Is this a bet/fold on the turn with 2 pair? 87 just got there and KJ is already there.

Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 6 Players
LeggoPoker Hand History Converter

CO: $46
BTN: $37.05
Hero (SB): $70.45
BB: $31
UTG: $10.80
MP: $33.10

Pre-Flop: 9[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/diamond.gif[/img] dealt to Hero (SB)
UTG calls $0.50, 2 folds, BTN calls $0.50, Hero calls $0.25, BB checks

Flop: ($2) 9[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/heart.gif[/img] (4 Players)
<font color="red">Hero bets $2</font>, 2 folds, BTN calls $2

Turn: ($6) 6[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">Hero bets $4</font>, <font color="red">BTN raises to $8</font>, Hero ????