Actually, there is a possibility that all of you are mistaken, including the people who wrote that article. Early on, I read an interview with Mark Ferguson (who played Gil-galad) and he said that they had initially filmed quite a few scenes of him fighting wiht Sauron, and getting tossed about pretty badly. They could have filmed that for the prologue, but taken it out later, during the editing process. As for the sword anomaly, who knows, Sauron could have changed weapons.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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