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Zhou Tian had maintained a clear advantage in strength from the start, the reason he had not subdued the Human Emperor's forces was simply because the Human Emperor had the aid of other powers. If those forces weren't interfering with Zhou Tian's actions, at this moment it wouldn't be Zhou Tian thinking about escaping, but rather the Human Emperor considering how to flee.
Given the situation at that time, if Zhou Tian had managed to escape and then launched an attack on those forces, there was no doubt that, with his strength, he would have severely damaged them.
For Monster Forces this might be manageable, but for NPC forces, if their strength were severely damaged, they wouldn't be able to recover quickly. So, given the circumstances at the time, even if Zhou Tian had later returned to deal with the Human Emperor after inflicting heavy losses on them, those forces would not have had the ability to intervene and help the Human Emperor again.