Those who were chasing Zhou Tian, aside from the reason that they needed to eat in this world at the moment, the relatively weak Magpies acted in such a way also because they immediately fled upon seeing Zhou Tian. Seeing Zhou Tian's reaction, those Magpies instinctively thought Zhou Tian was weak, which was why they chose Zhou Tian as their target for hunting and killing then.
Now, due to their contempt for Zhou Tian, those Magpies naturally wouldn't take him seriously anymore. And given the situation at the time, when Zhou Tian suddenly turned to charge at them, how could the Magpies have been prepared?
Resultingly, there was no accident when Zhou Tian counter-attacked those Magpies; they weren't prepared for this at all. Before the Magpies could react, Zhou Tian had already successfully reached them.