For Duanmu Huai, he didn't wish to fight a deity like Shub-Niggurath under such circumstances. However, luckily, compared to the Chaos Evil God, Shub-Niggurath is relatively easier to deal with---not because its power is weaker than the Chaos Evil God, but because the Chaos Evil God is a being with self-awareness and intelligence. Shub-Niggurath, on the other hand, is more similar to the Star Gods, more like an embodiment of rules or, in other words, it resembles a Star God that only absorbs energy around stars before obtaining a body.
It lacks a clear sense of self, has no explicit goals, only acts according to its instincts and rules.
But this is not due to stupidity, it is simply because it is strong. Like ■■■■, it doesn't need to exert effort to think about how to defeat an enemy because it is unstoppable, invincible, nothing can block it, and there is no way to threaten it.
And thus, it doesn't need to think, it can do whatever it wants, however it desires.
