Yah. The groups that appear near Burz can fall through the floor above, like the game forgets there's a floor there for the half-a-second it takes the victory sequence to start.
"Summoning" creatures doesn't seem to qualify as a spell. I just always target the summonors first; strategy and tactics are very important here--you have to be able to start combat in such a way that allows you access to the ones who summon, so you can get rid of them ASAP.
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