Even when compared to an old Supreme like Yin Heng, who had bathed in the Blood Exchange Realm for nearly a century, the gap between them was slight, at most a mere two or three parts, not so vast. Even if overwhelmed, one could still compete to some extent.
What about Chen Mu?
Now, in close combat, it was clear that Chen Mu indeed had not undergone Blood Exchange, for in his every move, he lacked that sense of drawing on the power of heaven and earth.
After completing Blood Exchange, a martial artist's Martial Body reaches the pinnacle of perfection, almost constantly in union with heaven and earth, so every action naturally draws upon heaven and earth, whereas Chen Mu still seemed to be in a closed state, which was a sign he was still in the Marrow Cleansing Realm.
In the Marrow Cleansing Realm, with a Grandmaster Martial Body, one could confront her head-on.