Some Psychics have the ability to make their pulse stop before they go into a trance.
It might be that psychics have amazing, supernatural powers that keeps their brain cells from dying without a flow of oxygen.
But more likely, he’s using an old fakir’s trick.
Here it is: Typically, the perpetrator allows you to hold his wrist. The pulse gets weaker and weaker until you can’t feel the pulse anymore.
But note he doesn’t suggest you listen to his heart.
That’s because stopping your pulse in one arm is easy and not too dangerous if done only for a short period of time.
All you have to do is hide a rubber ball under your arm and slowly squeeze to block the artery.