When you go into disc form no one can see your name. If you are in a different room and turn disc someone will come and you can kill them. Or you can go into the place where you usually deposit bananas and vent. If they know it's you, you can do other things to stop them. One of which is making a conversation so they stay in one room chatting with you,. Another is taking oxygen cans from the place and putting them elsewhere. One reason they may know that you are the traitor when you're in a different room transforming is that you walk into a room and when they go into that same room, there's you as a disc. Also, sometimes your comrade traitor throws you under the bus for no reason so that may be it (this happens so much and it doesn't help that you can't see who your friend plz help me on this). I hope this helps!