There's no question about it. The Witch King was a Wraith while Gandalf was a Miar. The nobody can kill a Mair unless you are a Mair yourself; or Valar.
Peter Jackson, I must admit, did a poor job at that scene. It would have been better if he would have stuck to the book with that sequence.
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I heard the bells on Christmas Day. Their old, familiar carols play. And wild and sweet the words repeatof peace on earth, good-will to men!
~Henry Wadsworth Longfellow
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