I found a minor bug with the Elmer Burbottom quest.
Normally, when you find out where Elmer lives and go to visit him, when you open his house door, his assassin teleports away.
Instead of opening his door, walk around the side of his house and click on Elmer from there. It will go through the normal quest conversation. Once Elmer dies, open his house door and the Dark Elf Theif assassin will still be standing there.
Sadly, the assassin does not have anything interesting to say, and, if you kill him, there is nothing on his corse.