Gu Hang knew that the Primal High Priest wasn't putting all his energy into dealing with the interstellar warriors and the Battle Nun.
It certainly wasn't because he underestimated his opponents.
Although Cui Kao was strong enough, he wasn't so powerful as to have that kind of capital.
In actuality, that guy probably had more important things to do. Those things were even more significant than the battle at hand, more critical than his own life.
He seemed to be conducting some kind of ritual.
Within Gu Hang's field of vision, he could faintly see strands of Spiritual Energy extending from Cui Kao's body. One of these strands continued to the blades of the wind power generator above the tower; five others were dispersed among the blades of five other generators in the area. Many more strands stretched out in groups, extending towards the horizon.