Given the situation at that time, Zhou Tian naturally wouldn't let those fleeing Ancient Powerful Beings escape. After all, things had progressed to a step that was already quite advantageous to him. And under those circumstances, it could be guessed that without a necessity, Zhou Tian would not easily let those Ancient Powerful Beings go.
Thus, as those Ancient Powerful Beings fled the Lair, Zhou Tian, failing to find them in their Territory, eventually caught up with the Ancient Powerful Beings he did find and killed them cleanly. Then, he pursued those who had evacuated.
No matter what, Zhou Tian had no reason to let those Ancient Powerful Beings escape, even if their hiding ability was extremely strong, Zhou Tian still needed to find them. Because only by finding those Ancient Powerful Beings could Zhou Tian have the ability to kill them and seize their Collection.