The removal of demon heart practically solved the fatal crisis of Wang Lu.
There were two reasons for the proliferation of demon heart. One was the breakthrough before the fight, and the other one was violently beating up Qiong Hua. Of which, the breakthrough before the fight accounted for the vast majority.
For an average person, breaking through Jindan just before the battle was amount to a deviant fantasy. Even for an experienced person like Qiong Hua, it was a mystery that was difficult to understand. Clearly, it was a rare thing.
