Hienkyaku (飛燕脚 Hienkyaku? lit. "Flying Swallow Legs"), also known as "Flying jump", is the special technique that Zero learns after defeating Jet Stingray in Mega Man X4. This technique is based off Jet Stingray's ability to fly in mid-air. By pressing the Dash button while airborne, it allows Zero to perform a horizontal air dash. It can only be used if Zero has not already executed a dash jump from the ground or a wall.