What is supposed to happen is you fall down a slide, take a corner, then slide down another ramp to be deposited on your butt (rather rudely) in the middle of a circular room with three temple vipers. It almost sounds as if your party got caught up between the two ramps???? I would try moving around a bit (jumping maybe?) to try to trigger your second fall. If nothing else, use a previous save game and try again, hopefully with better results.
Serath
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