For those of you new to the phrase, a wall kick is a double jump maneuver into a kick (roundhosue or back). The first jump is from the ground, the second is off a wall, poll, person, or some other upright fixture. The jump ends in landing on another human being with the execution of a kick. Anthony Pettis utilized this off the Octagon's wall, to, literally, devastate an opponent.
Why I would like to highlight this episode in mixed-martial arts history. Mixed martial arts is primarily two things: a laboratory and a gladiatorial arena. Anthony Pettis clearly uses as both. He makes it a point to utilize "low-percentage" techniques in his training and in the Octagon. He never says that it is easy, or that everyone can or should do what he does. But, by his determination and effort he makes everyone else "one-in-a-million" shot his million dollar shot- and he makes 'em count.
Enjoy. Train Hard.