£100 sat hand - How aggressive when bubbling?

[FoxUK]

Hi guys. This is my first strategy post so please go easy on me if this is blindingly simple stuff.

The game is a PS $100 satellite to a $1050 tourney. About 14 players left on two tables with 11 qualifying. The table has been tightening up a lot as people try to wait out the next big showdown.

Hero is currently in 6th place overall with the majority of the money on the other final table. No detailed read on button's play but he appears to have been tight and not overly aggressive. Hero has also been watching the play on the other table and is feeling pretty good about catching the place to the next tourney just by waiting for the smaller stacks to start going nutso as the blinds rise higher. 6 minutes until next level.

PokerStars No-Limit Hold'em Tourney, Big Blind is t400 (9 handed)

UTG+1 (t8210)
MP1 (t6217)
MP2 (t5082)
MP3 (t2665)
CO (t5132)
Button (t5564)
SB (t10435)
Hero (t11161)
UTG (t19675)

Preflop: Hero is BB with A[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">6 folds</font>, <font color="#CC3333">Button raises to t5564</font>, <font color="#666666">1 fold</font>.

So does hero call or fold? And why?