I'd say "haste" your party in addition to that. Toss a fireball or two into the room, targeted on the spellcasters, or have Jaheira do the Insect Plague on them. Get your main fighter on the thief and take him down before he leaves...he has some GREAT equipment, including a ring of Invisibility. Then concentrate on taking out the dwarf and the barbarian (Smelly, as the imp calls him).
It can be done. I do it each time right after the circus, and never lose anyone...and, other than the fireballs, do "not" resort to "cheese" (and I STILL don't understand how using legitimate spells that are in your spellbook are "cheesy." This isn't USENET, guys!
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