Originally Posted by Rhezuss
Oops...then he's dead...
I won't bother spending time on this quest then!

Tilian's quest to kill Saul has nothing to do with Kenneth. You can still finish it by talking to the guard at the lower door and getting him to open it. You can then reach Saul.

I am in blood
Stepp'd in so far, that, should I wade no more,
Returning were as tedious as go o'er.