Because they didn't have any advantage in speed, most of the monsters in the organization couldn't escape when they were surrounded by the undead. At first, the monsters might have been able to fight with the undead, but after a while, they were starting to feel the strain.
Even if the monsters had no limits concerning physical power and magic power, they could still get hurt! Even if they were hurting each other, the undead, given their almost deathless nature, were able to thoroughly suppress those monsters now.
As a result, although Zhou Tian encountered many monsters during his escape, every monster he encountered was already mostly dealt with by the undead. Even though Zhou Tian had the ability to save them at the time, he felt those monsters wouldn't be of much use to him, so he didn't bother with them.
