It is likely because they had started to gain the upper hand in the battle situation, that those living beings dared to fight amongst themselves at the critical moment of facing Zhou Tian. Otherwise, from any perspective, it seemed that those living beings would not have dissembled their own companions' platform at this current time.
However, regardless of what had happened in between, the battle situation has already become what it is, and Zhou Tian does not wish to meet his end at the hands of his enemies. Therefore, he must make an effort to turn the tide of the battle now.