How should I play in this position? (Bullies)

PokerStars Game #3070644277: Tournament #15173302, Hold'em No Limit - Level VII (100/200) - 2005/11/15 - 23:21:38 (ET)
Table '15173302 1' Seat #9 is the button
Seat 1: dP DIVA (2150 in chips)
Seat 3: ShrimpHouse (2035 in chips)
Seat 5: KaRock (2505 in chips)
Seat 7: bada**rabbit (2255 in chips)
Seat 9: PNasty420 (4555 in chips)
dP DIVA: posts the ante 25
ShrimpHouse: posts the ante 25
KaRock: posts the ante 25
bada**rabbit: posts the ante 25
PNasty420: posts the ante 25
dP DIVA: posts small blind 100
ShrimpHouse: posts big blind 200
*** HOLE CARDS ***
Dealt to ShrimpHouse [Ts Ks]
KaRock: folds
bada**rabbit: folds
PNasty420: raises 400 to 600
dP DIVA: folds
ShrimpHouse: ?

The villain has been bullying constantly with his large stack with 2 of us small stacked in what is now a 5 man sng. He hasn't showed down any hands.