In the underground base of the Space God King, he set up a powerful spatial barrier all around. Even though Zhou Tian could destroy it, if he really did so, he knew his main body's seal would be directly swept away by the spatial turbulence. Although Zhou Tian's true body wouldn't die, it would be hard to tell how long it would take him to find its position again.
Clearly, with the Space God King's abilities, facing such a situation, if he wished, he could easily find out Zhou Tian's main body before Zhou Tian himself could. This confidence in his spatial ability is precisely why he set up such a barrier at that time.
