Hienkyaku

"Hienkyaku: Dash button while jumping. May be executed in the air."

- In-game text

Hienkyaku (『飛燕脚』), also known as "Darting Swallow Leg", is the special technique that Zero learns after defeating Jet Stingray in Mega Man X4 

Similar Techniques

 * F-Splasher from Mega Man X5

Counterpart to this Technique

 * Ground Hunter