Top pair on the flop, gets raised, what to do?

Hi,
BigBiz is the hero in this hand, I just saw this play happen. What should someone do in this situation. (if you're multitabling and haven't picked up the tendencies) Chip leader just doubled up by calling an all in with ACE/Queen off suit two hands ago ( he wans't in the blinds, someone raised all in)
NL Texas Hold'em $100 Buy-in + $9 Entry Fee Trny:17971060 Level:6 Blinds(100/200) - Sunday, December 04, 02:11:41 EDT 2005
Table Table 66955 (Real Money)
Seat 10 is the button
Total number of players : 7
Seat 1: shawbrother ( $1355 )
Seat 2: bigbiz_3 ( $1435 )
Seat 3: CLESteamON_U ( $40 )
Seat 4: SNokes ( $1570 )
Seat 5: jlkikly ( $865 )
Seat 7: PokerZo ( $3570 )
Seat 10: Dr_Tran ( $1165 )
Trny:17971060 Level:6
Blinds(100/200)
** Dealing down cards **
CLESteamON_U is all-In [40]
SNokes folds.
jlkikly folds.
PokerZo calls [200].
Dr_Tran folds.
shawbrother folds.
bigbiz_3 checks. (holds king-9 off suit)
** Dealing Flop ** [ Ks, 8h, 3c ]
bigbiz_3 checks.
PokerZo bets [360].
bigbiz_3 calls [360].