super thin 3-barrel calldown?

[schwza]

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

CO ($859)
Hero ($567)
SB ($638.90)
BB ($977.80)
UTG ($289.45)
MP ($679.10)

Preflop: Hero is Button with 7[img]/images/graemlins/heart.gif[/img], 8[img]/images/graemlins/spade.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to $24</font>, <font color="#666666">1 fold</font>, BB calls $18.

Flop: ($51) 7[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $36</font>, Hero calls $36.

Turn: ($123) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $108</font>, Hero calls $108.

River: ($339) J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $809.8 (All-In)</font>, hero?

i have 399 left.

villain has pretty tame preflop stats, something like 19/13, but once a month ago he bet/3bet all-in on the river and showed a bluff (playing HU).

the only reason i'm considering it is that after the flop bet, the turn and river bets were instantaneous. my hand sucks but it's basically the same as AA unless he's turning A7/88+ into a bluff.