Plans to go out of university
While it was true that the blue-skinned evolved zombie had tried to flee after realizing that if it confronted the entire party of Bai Zemin it would end up dying, this did not necessarily mean that it was an intelligent creature. It was probably just a battle instinct in that the evolved zombie could sense which wars it could win and which ones it had no hope of victory in.
Since the world had become a kind of wild jungle, it was easy to assume that the evolved zombie, as an officially evolved creature, was capable of commanding zombies to some extent but only in relatively small numbers. This was natural, just as the adult lions were the leaders of the pack and led the smaller or weaker lions.
Probably, the evolved zombie did not want other zombies to be on the fourth floor because of the existence of this mutated plant as it was a treasure to it and it was probably worried that the plant would be taken away from it.