Depends if you took pleasure from the action you did. As it stands you are a bad, bad person.
I did not take pleasure in it. Which makes me a bad, bad person. Which is kind of sad.
Of course, the person who wrote the quest is baiting such people to kill said peace-loving Garrote. I think the person who hired you to do such an action is evil.
It seems some of the quests never got finished, like this one. I like the "moral dilemma" quests, but that entails a decision to be made, a path to take.