$27 Bubble against out of the ordinary limp

[eurythmech]

Normally I wouldn't have any problems deciding what to do here. Maybe I shouldn't have this time either, but the limp just puzzled me.

Villain is unknown but has been very tag so far.

PokerStars No-Limit Hold'em Tourney, Big Blind is t200 (4 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

BB (t2630)
UTG (t1395)
Button (t8020)
Hero (t1455)

Preflop: Hero is SB with 5[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img].
UTG calls t200, <font color="#666666">1 fold</font>, Hero ?