I think as long as the "majority" are in favor of living/getting by, they'll stop the one(s) who aren't. You'll run out of the room, call the friend/hot line, etc. and stay safe. I was once concerned I was going to throw myself out my high rise window and I called and made a dentist's appointment instead! In the space of that 5-10 minutes things shifted and the situation was changed and I was "safe" (and distracted/had been thinking about making the appointment instead of so intensely concentrated on whether I was going to kill myself or not). I would talk to your T, like everyone suggests and think of ways you can get help quickly when one of you feels afraid. Just figuring out how to break the concentration of the one making bad suggestions should help.