kyusho and KO's

[Goju-Ryu]

I've been seeing some things about Kyusho in the web and I found 2 videos that let me somewhat confused!
I saw a man putting another unconscient without touching him!
The url's for these videos are http://www.kyushoworld.net/videos/MVC-376W.MPG and http://www.kyushoworld.net/videos/no...%20Robert.mpeg

How is it done? I'm sure it requires lot's of practice and knowledge...
I've already seen it in TV, but in this case it was a priest making this to his believers in order to release them from the "evil" in them!
Kyusho is related with the study of pressure points right?