Re: Saito Sensei & the no-hands throw
I don't think there is something supranatural in ki, but to though someone without touching is beyond simple mechanics. One thing is to make extraordinary moves, which you told us of. But to make someone move like this who does not want to, you need more. Sometimes simple mechanics does help. There is just very little power, but high leverage. But beyond this you have to find a way to make him move unwillingly voluntarily. I hope I got the right expression/picture.
That is simple or more complex psychology.