After all, those plants wouldn't remember what Zhou Tian had done to them, so even if it wasn't Zhou Tian's first time dealing with them, those plants would still act as if they encountered him for the first time.
Based on the size and strength displayed by both parties at that time, those plants would naturally rely on their instincts to estimate the final outcome. Obviously, under those circumstances, from any perspective, if there were no unexpected accidents, those plants should have easily subdued Zhou Tian.
Thus, when making such arrangements then, the plants naturally only considered what to do after subduing Zhou Tian, without considering whether their actions would fail if Zhou Tian exhibited strong abilities at that time.
As a result, when the plants found that their actions failed to suppress Zhou Tian without any preparation, even if it didn't cause a negative response, the outcome likely slowed down their response by half a beat.