It was for this reason that Zhao Hai could not reveal all of his trump cards to fight the alien race. If he did, the people of the upper realm would know of his power. If the people of the upper realm knew about the existence of the realm, Zhao Hai would be hunted down even if he ascended.
Therefore, even though Zhao Hai wanted to deal with the outer realm demons, he had to borrow the power of others. He could show some things, but he couldn't let others suspect that he had a huge cheating device, the space.
Laura and the others knew this all too well. Thus, they were extremely careful when they did things. They would never cause any trouble for Zhao Hai and would try to keep a low profile.