The angels are indeed hard to pose a threat to Zhou Tian, but the threat to Zhou Tian does not only come from those angels. Therefore, when other powers that can genuinely threaten Zhou Tian begin to take effect, Zhou Tian must be careful about what threat these forces might pose to him.
For instance, if those angels do indeed begin to fight, it is inevitable that once they start fighting, they definitely won't be able to cooperatively hide their presence anymore. Not considering the threat from the large army of angels outside, merely the action of those angels withdrawing their hiding ability could be enough to cost Zhou Tian half his life.
If at the beginning, Zhou Tian using abyssal power in the heavenly world might lead to trouble, during regular actions, because the world consciousness of the heavenly world lacks the ability to think, even though Zhou Tian, as an outsider, walks internally, the heavenly world would not respond.
