Yes, this is an old, old troll (in the non-Tolkenien sense)...
Who was responsible for the death (er... un-death) of the Witch-King?
Eowyn or Merry? Sword of Westernesse or pure Rohan-gal pluck?
Peter Jackson got around it by digging out the WK - "No man can kill me..." Eowyn - "I am no man!" solution, which I've always found a little too neat...
Merry did stab the Witch-King from behind before Eowyn got a whack at him, but I think the context (in both the book and the movie) make it clear that she was responsible for his death.
IIRC the Witch-King was said to die because both Eowyn and Merry weren't mortal men (but a woman and hobbit). But I wondered recently whether he died truly or was just banished for some time, as when the Nazgul were flooded.
JRR Tolkien wrote:Merry's sword had stabbed him from behind, shearing through the black mantle, and passing up beneath the hauberk had pierced the sinew behind his mighty knee.
"Eowyn! Eowyn!" cried Merry. Then torttering, struggling up, with her last strnength she drove her sword between crown and mantle as the great shoulders bowed before her.
Merry's blow cause the Witch-King to topple (a blow to the knee) this gave Eowyn the advantage of height she needde to deliver the fatal blow.
There's a line in one of the appendices...or somewhere -- damn, now I have to go look -- in which it states that Merry's sword "unbound his sinew" or something, which weakened him and enabled Eowyn to get in a killing blow.
Definitely the blade of westernesse did it as there is mention in the books and history of the peoples who made that blade solely for the unmaking of the Enemy and his works. The encyclopaedia of Arda has a bit of info on that for anyone interested in looking it up. Jackson filmed it with the intention of leaving room for uncertainty though.
Arioch_Arioch wrote:Definitely the blade of westernesse did it as there is mention in the books and history of the peoples who made that blade solely for the unmaking of the Enemy and his works. The encyclopaedia of Arda has a bit of info on that for anyone interested in looking it up. Jackson filmed it with the intention of leaving room for uncertainty though.
Yet Aragorn said that "Destroyed are all the weapons that strike that terrible king", and Frodo's sword broke when he tried to fight off the ringwraiths...