Well this is a very cool kick! One of the gents at my dojo (Teak) told us about this during our last train. We were talking about how “complexity” can work well when fighting other martial artists (because it is unexpected), but it does not work well in self-protection (where the frantic, chaotic and highly-emotional environment demands simplicity).
Notice how the recipient drops his hands believing himself to be safely out of range and at a safe angle. Also notice how he does not react when Anthony Pettis launches himself off the fence (not that he has much time to) and it looks like he considered the attack over when Anthony's foot hit the fence. The complex and highly unusual nature of the technique renders it completely “off radar”.
Anyhow, the bottom line is that this is too cool for words and I hope you enjoy watching it!
All the best,