I sided with Morcock during the Timmy quest, and either I killed him, by punching him, or Morcock did, but he was definitely dead. Loot and pick up but no kill option on his body. After the battle of Pribyslavitz, I went back to the farm, and the woman was screaming about bandits. I thought it was like that random thief in towns, so went to help out.
The bandit was zombie Timmy. He attacked the man that gave him a job. After I tackled him, he stopped chasing the man. Then kind of just stood there half bugged out like Kunesh does. Doesn’t really attack you, but still has his weapon out, and if you stay close, you lock on for combat. I put some distance between us and knocked him out then killed him.
Interestingly, I wiped out Pribyslavitz, except for me and Morcock, but without alerting him, and then talked to him. The cutscene never triggered, probably because the other bandits were all dead. So I anti-climatically killed Morcock too.
I also tested if Cuman Killer really does require level 12, as it says in the info, and the answer is no. You can get it by killing the ~40 Cumans before Talmberg in Run! I even managed to save the Rovna blacksmith and a few villagers, but they won’t talk. The ones at the church just stand there, and the BS just walks around with his sword.