Sauron was 'thrown down' after wrestling with Elendil and Gil-galad, who were both slain. Isildur then used the hilt-shard of his father's sword to cut the ring from Sauron's finger. Sauron was then vanquished, and could not take shape again for many years. And that is pretty much all the information Tolkien gave us regarding Sauron's death. Both the movie and the fan-fiction are mostly speculation. However, unlike the movie the fan-fiction doesn't actually contradict anything Tolkien wrote.
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"If you would be a real seeker after truth, you must at least once in your life doubt, as far as possible, all things." -- René Descartes
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