Originally Answered: Which is that unique technique in shaolin kung fu?
"36th Chamber of Shaolin" is my favorite Chinese martial arts movie. I read about it being filmed in "Hong Kong Movie News" and "Southern Screen" Chinese magazines while it was in production, and I was eager to see it. I did see its debut at Tai Tin Sing (Great Star) Theater a few doors away from my residence in San Francisco's Chinatown in 1979. What you mention is a milder use of "Hung Shou Dzung" that is said to be able to kill people without touching them. It can cause death immediately or up to two years later, according to my Sifus in this technique. It can be used against someone in another room if the user can aim well. The basic idea is that there is a sort of Vital Energy, Energy Flow, Air, Breath, etc. that can be controlled well by masters of the proper techniques. It is called Qi in the modern Pinyin Romanization of Chinese symbols, Ch'i or Chi in the older Wade-Gilles system for Chinese words, Ki in Japanese, Gi or Ki in Korean, Chi in Thai, Khi in Vietnamese, etc., ... ... but "Is It Real?"
Massimo Polidoro and Luigi Garlaschelli of the University of Pavia in Italy were invited to partcipate in a TV show on National Geographic's "Is It Real" series by being given Qi blows by Leon Jay, an associate of George Dillman, at a gym in Milano, Italia (Milan, Italy). As all reasonable people could predict, Mr. Jay couldn't affect Signor Garlaschelli at all with his Qi projection strikes. One of Mr. Jay's students was also placed behind a dark sheet while Mr. Jay again tried his Qi punch, and again he failed to knock down anyone. George Dillman was interviewed by National Geographic after this and made silly excuses, e.g. saying the position of the victim's tongue and toes can stop him from being affected by the Qi punch. How asinine can anyone be? No objective medical research on accupuncture has shown that it actually works, and it is based upon Qi. That shows any logical person that there is no good reason to believe in Qi, so there is nothing that the monk could actually use to knock down Liu Chia-Hui (a.k.a. Gordon Liu) in the movie.
EDIT- Who is this Sensei Scandal who makes the quite ridiculous claim that Qi is "beyond science"? Science and scientific method lend themselves to any quest to discover the truth, and they are our best means of doing just that. To just try to dismiss science totally with a trite cliche phrase is beyond illogical. Anything is permitted when someone wildly claims there are areas "beyond science". Believers in all sorts of nonsense mindlessly utter this cliche, as if it supports the existence of such obvious nonsense as Qi, gods, ghosts, paranormal, Bogfoot, Atlantis, and myriad other such hoary hoaxes.
EDIT II- Shienara makes a good observation. George Dillman's students have been conditioned to fall down upon command, but our Italian skeptic resists such conditioning that is based somewhat upon Mesmerism, but I do question his sequence of events in the movie. Liu Chia-Hui was new at the Shaolin temple, so he hadn't had time to be "mesmerized" yet.