I goto the Riften jail and I've opened his cell and talked to him. After I tell him to join me and stop rotting in the jail cell the dailogue just ends and nothing happens. When I goto speak to him again it repeats the starting dialogue and he says that I've "finally come to kill him" again. I don't have a follower and I DON'T have any follower mods. Would really appreciate a quick fix please :)