If you are turtled and the opponent controls you from the rear in preparation to take your back (i.e. he is sprawled over your back - say, with his chest on your lower back/hips with his head pointing the same way as yours), how would you get back to guard or escape to a better position in a BJJ or nogi context? I can't seem to find anything on Youtube - the nearest is the escape from the Referee's Position in Freestyle Wrestling but that seems to leave the neck exposed plus the guy on bottom is wide open for the top guy's hooks. If I try to roll through, I always get my back taken. Thank you in advance for your thoughts.