I've seen a thread about this before, although I don't remember whether it was here or a different board. Anyway, it started with someone's observation that there was a walkable area in the lava. He teleported (Dimension Door, I guess) his mage out there, but found no items (which he was hoping for) and no way back except to teleport again. One of the replies was similar to your situation. The poster thought one of his party members had been knocked into the lava by being bumped during the battle, perhaps by one of the giants.
In any case, neither found a way out, short of teleporting.
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