Like I said before in detail
in post #6 already. This is nothing more than a front leg side kick to the knee!!! We learned this in Tae Kwon Do class in the 80s. I even show in detail Bruce Lee used that in "Way of the Dragon". Go watch the video at the precise time I wrote in post #6.
You know, in real life, nothing is precise like demonstration. The distance is NOT constant as opponent moves around. If the target moves forward when you initiate the side kick, the kick lands
before you get the full pivot and it will look like in the picture that the toe is higher than the keel. If you have enough distance to have full pivot, then you will easily see it is just a simple side kick to the knee.
It's just that simple. Just simple Tae Kwon Do side kick to the knee!!! If you want to learn front leg side and round kick, just watch the video of Bruce Lee, He pretty much started the front leg step in side and round kicks. My school really learned all these from Lee. We were trained to do that over the traditional back leg round and side kick.
If you still have question, watch this:
This video pretty much cover ALL the leg kicks used in UFC. Remember, Tae Kwon Do kicks are the main technique used in MMA. I am even surprised I start to see spin hook kick and even hammer kicks in UFC.
I don't want to have more rules in UFC, in fact I want less rules. People that don't want to get injure should not join UFC. Right now as is, the rules favor grapplers like you cannot strike the back of the head. During the tackle, the back of the head is always right there, if you can strike the back of the head, people will think twice before attempt take down. UFC is not for the faint of heart.