To use forearm (not fist) to hit the back of your opponent's head and knock him out is a good MA skill. Not too many people train this skill today. I have not seen it's used in UFC yet.It's supposed to be.
Dat saam sing is fundamental. There are soooo many Ip Man movies where he showcases this skill of smashing arms, right? The wooden dummy was designed for it ...
Thanks for mentioning it. I hope WC students notice.