Everything get´s really quick blurred after a few seconds you pass out. Before you pass out you can´t control your body and movements, so no way to get out. There was a video from a young girl that hanged herself and grabbed the noose from the moment she stepped off the chair. She could be rescued, but also had no chance to get out of the noose by herself, her parents helped her out. She only was able to prevent herself from passing out quick. If you are afraid you will do the same use handcuffs or cable ties to tie your hands, taht you cannot reach the noose. Without grabbing the noose, the noose will do it´s work and there will be no panic.