unless the assassin is evil or something, this quest seems poorly balanced. MC has barely done anything besides walk behind Mr. Stabby while Mr. Stabby goes on a stabbing spree.
I mean, what was stopping this guy from doing all of this on his own with his pointy knives and magic ring? Sure, more people means better protection for the lady, but if Skyrim taught me anything, its alot easier to save the damsel once everyone has been thoroughly stabbed from the shadows.