Zhou Bao was not afraid of being discovered by the people who were hiding in the darkness from Divine Wind Palace. Even the Old Weirdo at the Lord of Heaven Realm would need the Air-frozen Bead to sustain himself in the surging tide, apart from everyone else.
Even if there were people hiding in the darkness from Divine Wind Palace, they were just there to observe the actions of the Old Weirdo at the Lord of Heaven Realm and they did not really bother about the others. Moreover, Zhou Bao's plan was not to kill the two Genuine Immortals but just to break up their defensive formation.
While Zhou Bao was taking cover in his hideout in the darkness, he saw the two Genuine Immortals taking out numerous materials for setting up the formation from a ring which was similar to the sacred relic belonging to the Black Wolf Tribe. He was so surprised that his mouth fell open.