Zhou Tian himself was also a Human Emperor, so how could he possibly make such a low-level error? Under such circumstances, if Zhou Tian behaved in that way, it could only mean one thing: when he attacked, his aim was not to kill, but rather he had a different objective in mind.
"Damn it!"
Given the situation at the time, understanding Zhou Tian's intentions wasn't challenging; at least, the Human Emperor only needed a glance at the battlefield to grasp the kind of idea Zhou Tian had in mind.
Just as the Human Emperor knew from the beginning, fighting Zhou Tian in that area was bound to cause considerable destruction. He was mentally prepared for this eventuality when he confronted Zhou Tian. But even with that mental preparation, witnessing Zhou Tian relentlessly destroy everything in that territory with one ploy after another was a profound shock to the Human Emperor.