The Emperor-level Boss was very aware of Zhou Tian's powerful strength, which was so overwhelming that it drove him to despair. That's why the Emperor-level Boss collaborated with other monsters and NPCs to confront Zhou Tian. Even though his territory was now occupied by Zhou Tian, the Emperor-level Boss merely wanted to reclaim some of it, as the idea of seeking revenge against Zhou Tian had never existed from the start.
For this reason, when the Emperor-level Boss saw Zhou Tian, he was terrified at that moment. Without needing to fight, the Boss knew very well that he had no capacity to resist against Zhou Tian, his enemy.
Seeing Zhou Tian and fleeing was undoubtedly the right response given the Boss's strength. However, correct as his response might have been at that time, it was destined to be ineffective, as he was facing Zhou Tian.
