Plane Sailing said:Doh! The answer was there staring me in the face all the time!
(In that case the Balor should have hovered and imploded away - see if the wizard can save a *second* time...)
Actually, Implosion has a duration of Concentration (up to 4 rounds).
If the Balor was struck before its next action (very likely), it could well lose the spell. Even if it didn't, it then had the Barbarian and the Dwarf to deal with. Well, the Barbarian, at least.
Cheers!