Yeah I had a pretty similar moment as well. I was in Elektro, looking for people to kill as I was bored, and I noticed a guy go inside of the north fire station. I decided to run down to kill him, but at first I decided to mess around with him. I told him to get on the ground, but he didn't know how to do it. So I told him how to, and he went to the ground. Then I told him to get up, and once again, how to get up. And he got up. Then I told him he could go on his way, but I circled around the fire station and went through the back door.. And killed him. I feel EXTREMELY bad about doing that, as I may have created a bandit because of those actions. I promised myself I would never KOS unless they were close to me and had a gun. I just wanted to find him and give him a bunch of my gear, but I never saw him again.