After being subjected to PP striking, I can attest it is nothing more than overloading the nerves of the body to cause pain, disrupt the central nervous system, shock and thus KO. Any blood related injury, vomiting etc is merely caused by the above confusion, overloading or freezing of nerves, leading to the veins being unable to pump blood by the motion of surrounding muscle back to the heart, and thus to the brain etc....thus we get blood clots and shock.. This is the best I can explain it with modern western medicine. The Chi theory is crap, but within the context, it works to deliver results re: knockouts and pain releif.
I can tell you it is real, I am not a willing uke. Yes, some people are less supsectible to pain compliance tech, but the (real) KO's work 100%
I don't expect a no touch KO or Yogic flying soon though.
As for the weird crap in Chinese medicine, sure enough, Rhino Horn is nothing more than quackery, but some of the better herbal stuff like a ground up ant's nest is merely acrude way of geting methanoic acid as a sterilising agent/antistringent.