As the signature ability of Xinzhai Sect, Flying Dragon Takedown's trademark wasn't its speed, but rather the lack of signs it gave away when activated. Against it, one could only rely on absolute reaction. By the time one senses the threat, they would already be in a situation where they can neither dodge nor parry it.
With this sword move, the Xinzhai Sect guarded the unshakable rank one throne in Japanese Kendo. It was one of the force measures that dominated Japan, comparable even to "Amaterasu Heavenly Palace" and "Apothecary Temple". It was way beyond the reach of "Extreme Hadou Sect" that rose in the recent ten or so years. Of course, in terms of combat power, the steadily advancing "Extreme Hadou Sect" had its own aces in its upper echelons.