I know in Apoc. falling debris can kill just about anything soldiers, aliens, terrorists.
While on a Snakeman terror mission recently, a civilian somehow got on to a roof of this warehouse then walked off the side landing directly on top of a zombie killing it and the Chryssalid inside. Im not sure how this happened. I never seen this before playing OpenXcom so is this a bug or just game design ? I didnt post this as a bug since I didnt have a save to reproduce it.