One Blow and
Well, perhaps!
If you push both your thumbs into his eyes, or hit him on the back of the head with a brick. Both blows will cause the greatest inconvenience, perhaps even death.
There are certain points in the body where a strike can cause much damage. As any cricketer or rugby player will tell you. As will most martial arts teachers.
One problem is that many so-called self defence instructors will say the same thing. Hit him here and hell drop dead! Well, he may indeed drop dead, but so will you, in effect, because youll land up in jail for murder. Probably. But thats another article on legal issues
Dim Mak, atemi, kyusho points are acupuncture locations. As youll be told by almost every martial artist.
Wrong, not so! Oh, the books spout this rubbish, as do bad instructors. But they are incorrect. And should know better.
Dim Mak attacks will certainly drop an enemy. Provided that they impact either a major internal organ, muscle or nerve supply. The effects are physical, not energy based.
Kick up inside someones armpit and he wont have an arm to use for ages. The same as if a drunken man falls asleep...