The Chinese Mind-Control Technique is a spell that was used by Lady Toni Bevell to mind-control Mary Winchester. With this spell, the user could create a very potent hallucination of its victim being mentally strangled. The illusion, however, is relatively easy to break.
The procedure of the spell is very straightforward, the caster simply has to slice their hand thereby drawing blood and utter the magic word: "Xi". Once cast, the spell will take root inside the victim's mind allowing the user to bend their target's mind to hallucinate that their throat is closing so they can't breathe.
Breaking the spell is very simple. As the power of the spell relied on the caster consciousness, the spell effect will cease by simply making the caster unconscious.