In the film The Princess Bride, when Inigo and the Man in Black have their chat before their duel, the Spaniard tells his adversary about his father and the six-fingered man:
Inigo: My father was slaughtered by a six-fingered man. Was a great sword maker, my father. When the six-fingered man appear and request a special sword, my father took the job. [Draws sword.] He slave a year before he was done. [Hands sword to Man in Black.]
Man In Black: [Admiring the sword.] I've never seen its equal. [Returns sword.]
Inigo: Six-fingered man returned and demanded it, but at one-tenth his promised price. My father refuse. Without a word, the six-fingered man slash him through the heart.
It seems quite clear from this exchange that when Inigo hands his sword to the Man in Black, it's the same sword that his father made for the six-fingered man: hence its relevance to the conversation. But if the six-fingered man killed Domingo Montoya because he wouldn't sell him the sword at a lower price, why on earth did he not take it with him afterwards? The sword was important enough to him to kill a man for it, and yet he didn't keep it after killing that man? It doesn't seem to make sense.
Is there any explanation (e.g. in the source novel) for this apparent contradiction?