Rokushiki/Rankyaku

Rankyaku is one of the six techniques of Rokushiki.

Overview
The Rankyaku  (嵐脚 Rankyaku?, literally meaning "Storm Leg")  is a powerful projectile technique, in which the users start by kicking at very high speeds and strength, sending out a sharp compressed air blade that can slice objects and greatly damage a human body. However, it has been shown that almost any length of appendage (such as a tail or neck) at high velocities are also capable of this move.

Variations of Rankyaku

 * Draining Storm Leg: Used by Ryu here. It seems to be the same as the normal Rankyaku, or Storm Leg, but with the ability to drain the opponent's energy.