Where can I stun people with one punch without killing them? How to use the hand knife?

Hit the nerve plexus, or hit the artery will make people unconscious, young man, I'm just saying, you mustn't do this, I'm not responsible for what happened. There is a position on both sides of the neck called arterial sinus. As for the sliding hand knife, it has a radian. If you cut into the nerve plexus on both sides of the neck, you will lose your combat effectiveness, will not feel dizzy and painful, and will easily cause casualties.