[LO8] facing unusual preflop and flop action

[Olrik]

PokerStars 0.50/1.00 Omaha/8 (10 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is CO with A[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, <font color="#CC3333">UTG+2 raises</font>, <font color="#666666">3 folds</font>, Hero calls, <font color="#CC3333">Button 3-bets</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">UTG+2 caps</font>, Hero calls, Button calls.

Flop: (13.50 SB) 6[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">UTG+2 bets</font>, Hero calls, <font color="#CC3333">Button raises</font>, <font color="#CC3333">UTG+2 3-bets</font>, Hero folds, <font color="#CC3333">Button caps</font>, UTG+2 calls.

Turn: (11.25 BB) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG+2 bets</font>, Button calls $0.35 (All-In).

River: (12.60 BB) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

Final Pot: 11.95 BB

villians were both unknown at that point. the pot is too big to fold for 1 bet on the flop but facing a raise and a 3bet (and a likely cap) and considering the preflop action i had to assume that at least another A2 is out there so i fold. opinions?