What to do...

[Duece Three]

I am the chip leader (27k) with 31 players left...
A few other players have 20k or more...

Blinds at 300-600 and I decide to call on the button w/5 [img]/images/graemlins/spade.gif[/img], 7 [img]/images/graemlins/spade.gif[/img]. (6 see the flop)...

Flop comes all spades, cecked around to the player 2 to my right (who has the second biggest stack at my table), who goed all-in for 21k...

I remember this player pushing all-in w/A [img]/images/graemlins/heart.gif[/img], 10 [img]/images/graemlins/heart.gif[/img], with flop of K [img]/images/graemlins/heart.gif[/img],J [img]/images/graemlins/club.gif[/img], 4 [img]/images/graemlins/diamond.gif[/img], getting called by pocket Kings, and catching runner, runner [img]/images/graemlins/heart.gif[/img] just a few hands previously...

What should I have done?

Thank you in advance for your thoughts.