Given the circumstances at the time, even if Zhou Tian was not acting against them at the moment, he would definitely not spare those Ancient Powerful Beings afterward. Thus, unless they killed Zhou Tian, they were bound to fall one by one into Zhou Tian's hands.
And those Ancient Powerful Beings understood that reasoning at the time. But even though they understood, it was useless. Because no one dared to be the Pioneer at that moment, without time to prepare, even if they did not take action they were doomed, in order to survive a moment longer, those Ancient Powerful Beings could only make what seemed to be a very foolish response.
Thus, with the circumstances at the time, when Zhou Tian promptly came to chase and kill, he naturally had the most suitable environment to exert his strength. And with the circumstances at the time, as long as Zhou Tian performed well, it really wouldn't have been a problem to directly kill those Ancient Powerful Beings.