Spencer Petersen said:At the end of Black Ops,its apparent that Victor Reznov wasn't with you all those missions past the prison escape, as he was just a figment of your imagination due to brainwashing, which makes me wonder, how the hell did all those people get shot when we were on missions, did I shoot them? Was it someone else I was projecting Reznov on? Was it magic? None of these questions were answered at the end.
Reznov like msot NPCs doesn't kill many enemies, depending on the situation we can hypothesize that he projects Reznov on to other GIs on the ground or our character kills them himslef but imagines Reznov doing it.