Realizing that there wasn't any trap waiting inside the cities he had encountered so far, but instead some kind of defensive system that he was completely unfamiliar with, Xuan Hao decided to not continue lingering around outside of the city he now found himself in front of.
The main problem he found himself facing now was the fact that he didn't really have any reliable method to guard himself in front of this unfamiliar defensive system. The only thing he could do was hope that ordinary hiding techniques would work against it with the support of his high cultivation base.
If it didn't work, he could at the very least use the opportunity to learn more about the defensive system and try to figure out a way to sneak past it the next time around.
Of course, there was always the chance that the defensive system wouldn't care about him even if it noticed his presence and would only act if it detected hostile intent or dage to the city itself.