Chen Dengming had been studying martial arts and Daoism for quite some time and was gradually getting a grasp on certain 'things'.
When he initially fully grasped the Sword Intention, he manipulated the sword with his intention, achieving a unity of man and sword. Unintentionally, he integrated martial arts and Daoism into his control of the Instrument Control Skill.
This made it so that whether he was performing the Daoism or the ordinary sword skill with his big ice blade, he could command it as easily as he could his own limbs. The spiritual energy consumption greatly reduced, and its power greatly increased.
Now, after pondering over this for some time, Chen Dengming vaguely had some new insights.
He once believed that the reason martial arts could not tap into nature's spiritual energy was due to its inability to form a 'password' that resonates with nature's spiritual energy, similar to Daoism.
For a long period, he was looking for this password.