I am too perfidious by nature to believe claims from instructors, especially paid ones, about my limbs moving by themselves...isn't like 80% of the population susceptible to placebos and psychocomatic sensations? Isn't it likely that some old-ass chinese men just had a bunch of idiots hero-worshipping them?
That being said I used to do tai chi and loved it. Once I put my brother through the kitchen wall with an excellent tai-chi learned stepping trip, as he was choking me.
"Ah, those endless forests, and their horror-haunted gloom! For what eternities have I wandered through them, a timid, hunted creature, starting at the least sound, frightened of my own shadow, keyed-up, ever alert and vigilant, ready on the instant to dash away in mad flight for my life. For I was the prey of all manner of fierce life that dwelt in the forest, and it was in ecstasies of fear that I fled before the hunting monsters."
Jack london, "Before Adam"