For one thing, no one can compel or hypnotize anyone else without the consent of the target person regardless of their dietary requirements of the original person making the attempt. The truth is, is that there are some dopes who have never studied their mind and give their consent to such things so willingly that for the skilled, bending people is almost too easy. Con artists and charlatans of all sorts have been studying this art for most of the history of men. People who study the mind such as the Asian Acupuncturist and the Voodoo priests and priestesses have learned much about how to extend the spirit beyond the skin and commune with others in that fashion. It is possible to use such methods to communicate without words and gain consent in such fashions and there are people with presences so compelling and charisma so outstanding that people seem to fall all over themselves to obey.