If you really think about it, Zhou Tian was merely concerned about the combat power of those Demigods when they joined forces. Without considering their collaborative strength, he actually never took them seriously based solely on their individual powers.
When he entered this space, Zhou Tian had already anticipated that such a day would come, so the arrival of those NPC Demigods did not surprise him. Upon discovering their presence, Zhou Tian simply glanced at them and then became cautious from that moment onwards.
"Hand over the corpses and your life will be spared!" The Demigods were unaware of Zhou Tian's confidence despite knowing he was an Emperor-level BOSS and even aware that he had killed one of their companions before entering this space. But what did that matter? With the strength of their team, the NPC Demigods did not believe Zhou Tian was capable of resisting them.
Confident in their own strength, those NPC Demigods had nothing good to say when facing Zhou Tian.