Unfortunately, the swamp contained an enormous amount of highly adaptive parasitic lifeforms which quickly swarmed Sauron and the Nazgul. The only ones to escape the swamp were the Witch-King, Khamul, and another Nazgul.
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"And forth went Morgoth, and he was halted by the elves. Then went Sauron, who was stopped by a dog and then aged men. Finally, there came the Witch-King, who destroyed Arnor, but nobody seems to remember that."
-A History of Villains
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