I just finished a game of HCTDM which happened to be hacked or whatever you want to call it. I've seen posts that mention these type of games where everyone you shoot at is apparently your teammate. Well that's not true. After I shot the first person I saw who was wearing a light colored uniform, I died of course due to Ricochet; so then I started looking for players wearing a dark colored uniform and once I found them I was able to kill them with no problem.
So for future reference, if anyone gets put into a game where no one can be identified as foe or friendly, just pay attention to the color of their uniform. If you shoot at a person wearing a light colored uniform and Ricochet kills you, then you know the enemy is wearing dark colored uniforms.