Zhang Yu sensed Daoist Gao's presence. From the way he had concealed himself to one side, it was not hard to infer that he intended to scheme against Zhang Yu, or against whoever came to invade.
This was indeed an excellent strategy. This man's fundamental Dao technique was unique; only by hiding in one place could he properly put it to use.
Hidden amid the cover of countless flying vessels, he should by all rights have been impossible for outsiders to discover. He could then calmly unleash his Dao techniques upon the enemy. Even if danger arose, given his level, he could sense it in advance and retreat in time.
But Dao techniques were mysterious. You could never know what methods your opponent might possess.
Now that Zhang Yu had discerned this man through the "Eye Seal" and the "Hearing Seal," the balance of advantage between enemy and ally had instantly reversed. And the moment he saw this man, it meant he could use the "Six Rectified Heavenly Words" on him.
He reached out and took out the prepared Dao talisman.
In his original expectation, this was merely a precaution and arrangement. Perhaps he would have no opportunity to use it afterward; perhaps even if he found this man, there would be no chance to activate it.
Yet the present circumstances were ideal.
Of course, if he had not discovered this man beforehand, the result might have been the reverse. It had to be admitted that, when fighting within the Celestial Xia Domain, the turning of heavenly secrets undoubtedly favored their side.
Daoist Gao was trying to observe the qi mechanism. Yet Zhang Yu stood within a flying vessel wrapped in golden sand, and he could see nothing at all. Thus, he could only wait there for a while. So