The chin jab is a very strong move. This short clip starts with a discussion of even small people can create a lot of power with proper body dynamics.
Done correctly with good timing, this technique can be a fight ender by itself but never, never, depend on that!
It also lends itself nicely to combinations with other techniques.
Here is an introduction to the cup hand strike. Very good in combination; it is fast and can create openings for more serious follow-up.
For you seniors, you will be glad the girls in your youth did not know how to slap like this! :)
And, for your viewing enjoyment, here is an expert doing a demo…Martin slaps Slavo.
The knee spike is a natural follow up to the chin jab or an ear cup (boxing the ears) used as an entry.
HAPKIDO CANE: Big Stick Fighting from the Dojo to the Street by that force of nature, Alain Burrese.
Once again Alain has created a quality product out of the strongest interests of his life, self defence and Hapkido.