Originally Posted by PowerPyx
Were the people on the ground still moving a bit? If they weren't then they died. Can sometimes happen that the guards shoot & kill each other, or that you accidentally stomp an unconcious person (which will kill them as well). Could also be a bug - there are quite many in this game.
Everything is alright with the vid and you just need to use your fists instead of lethal weapons. This has been confirmed multiple times.
I'm pretty sure they were all moving, but I wasn't checking their bodies after I beat them up. Does counters count as a kill? Because I was doing that with the ones that started attacking me at the end.