It's only a Joke

Crane the Third knew nothing about Jiang Chen's sword methods. He thought he could kill this disciple of the Natural Law School simply with his speed.

"Great… great sword. But even so, it's impossible… impossible for you to have detected my position!" Crane the Third covered the wound in his chest with his hand and spit out his disbelief. He couldn't accept that Jiang Chen had cracked his unique movement.

"Because your secret method has too many flaws. It's only a low-level method," Jiang Chen said.

A method would evolve for many reasons. It could even become completely different from what it originally was.