Hi. I thought that I had completed the quest (as it came up as completed) when the mage was put in prison. But after I travelled back to Windhelm a few times, it started again, as I had apparently caught the wrong person. I spoke to Wuunferth (the mage), and patrolled the stone quarter. I saw Calixo (or whatever his name is) and chased him back to the house that I had already purchased (Heljeim or something). He ran into the secret room, and when he detected me, he started attacking. The quest update is still on "catch the murderer", so how do I do that? It won't let me. Every time he loses all of his health, he just crawls around on the floor and gets back up again a minute later. Eventually he stops fighting and returns to the secret room. How am I able to finish this quest?