The prophecy didn't say that the witch-king couldn't be killed by a man, just that he wouldn't die by by the hand of man.<BR>Anyway, I believe that Merry's strike was far more important than Eowyn's in the Witch-King's demise. It was Merry's sword that caused him to die because it was woven with spells by the men of Westernesse, not the fact that he had a normal sword thrust at him by a women in his non-existent face.<BR>The sword broke th spell that held his unseen sinews together. The unseen sinews were in his entire body, not just the knee. The sword strike meant that Sauron's ring spell that allowed him to take a physical form was broken so he was killed. Eowyn's sword to the face, although looking impressive I think was just for show but in the end had no effect on him.
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His sword was long his lance was keen
His shining helm afar was seen
The countless stars of heavens field
Were mirrored in his silver shield
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