Was it because a body was spotted? I was at the social gathering and my target wouldn't speak to me anymore, so I was forced to knock them out. While I was carrying them, someone spotted the person I was carrying but not me. But throughout the session nobody died at my hands. Not Seen was checked and No Deaths was checked, for all missions. One unconscious body gets seen and Clean Hands is gone and Ghost is demoted to Shadow? Wow, Dishonored.