If it comes down to that, grab testicles and squeeze as hard as you can, also bite anything you can get, rip it off and bite again. Remember your elbow offers some amazing leverage. If you can get an arm around his neck, use your other arm to cut off air flow. Whatever happens don’t let go. No air means no power and unconsciousness. One he’s incapacitated find a way to bash his head in resulting in death. Otherwise the nightmare might continue upon awakening. I know this all sounds fatherly, if I could be there to protect you I would. I hate predatory creeps. 💜