Ling Kong Jin (empty force) is a method of energetic manipulation (no hands) used by some Kung Fu - Internal Martial Arts teachers. I have seen demonstrations where students were knocked out, knocked down or thrown away by their teacher without physical contact. I have NEVER seen any demonstrations of these techniques on an unwilling/ resisting opponent that didn't end badly for the teacher (see second video). I am not saying it doesn't exist just that i have not seen it.
You decide......