I use soemthing like this a lot. I tap a pressure point between the second and third metacarpals on the hands with one midle knuckle and simultaniously hit large intestine point on the upper arm. It makes everything from the LI point down go numb. It is a really save combination in and of it self, but can set up some pretty dangerous knock outs, so it is not somethign you should be using in sparing if you do not have a qualified healer around.