This sidekick to the knee is an unorthodox technique, originating from the art of Savate and/or Bruce Lee’s Jeet Kune Do. It is also common in some karate and kung fu styles. It works for Jones due to his reach advantage and, because sparring partners rarely use this attack, opponents are not familiar with it. (Tip for Jon Jones: Please try this)
When attacking with this kick is very easy to miss the target, so it is surprising how successful Jones has been at using it.
Just for fun, here is a counter shown to me by a Dutch Silat specialist more than 25 years ago:
As readers can see one way for a fighter to stop this kick is to lift their knee higher than the opponent and hit him with their own sidekick stopping him in midair. This works better for the taller fighter.
My original post: https://www.bloodyelbow.com/2017/7/11/15918932/defeating-goat-beat-jon-jones-part-1-technical-breakdown-ufc-striking-wrestling-grappling-editorial