Well my theory as to what happened is that since Maia don't have proper bodies, they just "cloth themselves" with them rather than live in them properly and when they trash them and have to leave them the body just goes whooof... but I think that when his finger was severed.... part of Sauron's self was split off and when he was able to take on a body again it formed a "mini-me", a tiny Sauron clone casting it's tiny lidless eye around the place.....
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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