Fortunately, he was prepared. The White fog in the mountains was created by the water mist formation. The reason why the White fog didn't drift out was because of the barrier formation.
However, Zhao Hai also knew that this method wouldn't be able to hide it from the other party for long. The other party would soon realize the difference in the White mist, and then they would attack.
Just as Zhao Hai had expected, the Outworld fiends had sent a few formation Masters. When the red light shot into the mountains, they had been observing the changes in the mountains. When they saw that the White mist only churned a few times but did not disappear, they couldn't help but frown. After observing it carefully for a while, they couldn't help but smile. They had already discovered that Zhao Hai was using the mist formation.