Quote Originally Posted by IanYang View Post
But I do know what I will do when I am repeating this quest. I just can't pretend I don't know anything when I kill them.
No offense, but if you have this strong of a reaction towards morality in a video game, maybe you shouldn't play?

A great deal of people have given you several valid suggestions - and if you can't do it because you think it's wrong (completely ignoring Roleplaying), it would probably be best if you follow the above advice. Imo anyways.