Flying knee

Attached video will be just short clip of a flying knee.Not only the fanciful flying knee impresses people,but also strike the opponent at extraordinary fast speed.
There you go !

&Hey guys,what do you think about various forms of martial arts?
Here's a list of different types of martial art and a personal rating of mine for self defence
Do contribute if you have any comments about other martial arts.

Muay thai-Kickboxing which include elbow and knee 4/5
Boxing-Striking with hands with the aid of body momentum 3.5/5
Sanda-Kickboxing which involves grapple 4/5
Jit jusu-Ground fighting which include submission 2.5/5
Judo-Grapples and slamming 3/5
TKD-Offence with kicking 3/5
Krav Maga-Self defence with brutal techniques 4/5
Akido-Pushing the opponent around(HAHAHA) 1/5

Kindly add your thoughts and martial arts(if you have any)
Thank you