It's blatantly obvious that it was the heat of the cliff-face that caused Gandalf to let go. All those flames in Moria must have made it hot enough to fry eggs on. Besides, his hobby was cliff-jumping: JRRT tells us so in HoME XIV.
It couldn't have had anything to do with the huge Balrog hanging from his foot by its whip of fire, dragging him into the abyss since, as we all know, Balrogs can fly.
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Man kenuva métim' andúne?
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