Gosh - you know I never did do this quest so my advice will be worth about that much. Presuming you have saved your game in a location and time near this encounter Have you tried just killing him??? I mean an assassin quest and an assassin dagger - doesn't it seem like just the right thing to do??
(p.s. I really didn't do this quest so I really don't know from experience. No doubt some knowledgeable pernem will come along shortly and give you the real scoop. I just hated seeing your message with a "0" next to it)
Wyv
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