I am not sure if Sauron's weapon choice is ever definitively stated. Maybe the filmmakers just gave him a souped up version of the witch king's weaponry. Frankly if Sauron could wipe out swathes of warriors like that I doubt the siege would have lasted so long. I thing in one of the drafts there is a reference to Gil-galad wrestling Sauron (echoes of Felagund).
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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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