Well I recently generated a new world medium size all haunted, it was hard to generate so I had to make 87.5%(14000-13500 tiles evil) of the world an evil biome.
So I started the fort in a terrifying location that was near to some civilization, managed to get underground before something killed all of my dwarfs and managed to survive, everything is good until a merchant visited my fort and one of hes donkeys was Reeeally slow and couldn't escape the fort after the merchant left (I didnt want the risk of anything getting in my fort without me knowing so I didnt notice that donkey until it got enraged).
So the donkey is carrying all those items around my fort and got enraged, so I killed him with my miner military dwarfs and dragged the body behind a wall before it could reanimate.
and now I have dwarfs being possessed that are trying to kill each other.
I didnt kill any dwarf so is this a bug?