Whether Zhou Tian could be left behind was not important, given the situation at that time. If they continued their search like this, Zhou Tian's days would definitely not be easy. Even if they couldn't take Zhou Tian's life at that time, their method could still hinder Zhou Tian's actions. At the very least, under their encirclement, it had become highly unlikely for Zhou Tian to launch an offensive against those weaker gathering places for living beings as he had done before.
In fact, when those living beings were enraged by his actions and completely surrounded him, Zhou Tian's predicament had indeed become extremely dire.
Zhou Tian's power was indeed formidable; he wouldn't consider any of the living beings' members worth his attention. Even for those existences at the level of kings, although it might not be easy for Zhou Tian to clean them up, if he truly wanted to do so, the possibility of Zhou Tian killing them was indeed very large.