Knowing that the divine sense he had left within the four was about to be noticed by the old remnant soul, Xuan Hao decided to disperse it on his own before it was discovered. Knowing it wouldn't make much of a difference even if he attempted to hide his divine sense. If anything, it ran the risk of him being targeted by the old remnant soul, something he didn't want to happen given how he didn't know for sure whether the formations within the small tower could launch an attack outside the small tower.
