What if I get stuck in a hypnotic trance?
It is simply impossible. When the session is over the therapist will simply ask you to open your eyes.
If the hypnotist had a heart attack during the session and he cannot ask you to open your eyes, you will simply open your eyes by yourself after a few moments once you get bored with no voice to listen to.
When there is an emergency situation, a fire for example, you will respond to it in a normal way. You will not need the hypnotist to say anything. You will open your eyes and keep going on your own.