Zuo Qinglong left the Realm King Planet and had been studying the movement technique Lin Shen gave him.
It wasn't a complete movement technique, more like a method specifically designed to counter certain attacks.
When Zuo Qinglong tried it out, he realized that the technique itself wasn't complex; it seemed complex because the real ingenuity of the technique lay in the psychological contest between opponents.
The technique itself had only nine variations, but using different variations flexibly according to the opponent's psychological reaction and the environment was the most difficult part.
To master such a movement technique, one had to practice extensively, getting all nine variations to the point where they could be executed instinctively, to achieve the highest realm of adaptability.
Zuo Qinglong first practiced the technique until he was proficient, then brought Zuo Qingmeng to spar with him.