I found, I think it was three bugs in the same day for the same Hired Thug trio. So, they showed up in Winterhold after I slew two guards. They weren't hostile, even if I talked to them, and then they started following me around, like Followers, just saying 'yes' when I talked to them, like guards have their generic dialogue, also, I was able to kill all three ONE AT A TIME, because the survivors only said, I'm going to find whoever did this,' every time I killed one of them. So, these three were never hostile to me, at all. Then, because I still had a bounty in Winterhold, I went to the longhouse to surrender. When I got of prison, the bodies were gone, but the weapons were still there. I also the same day, though not with the thugs, found a wolf (a dead wolf) that had its back legs in the air, and everything else under the snow.