Sitting back and watching the others fight, Zhou Tian was no stranger to such situations. Now, it all depended on the performance of those NPCs, who were clearly waiting for an opportunity to strike at the monsters.
Not to mention, those NPCs even dared to ambush those monsters, and from the looks of it, they planned to take down all the monsters. With such confidence, even if the NPCs were not as strong as the alien space monsters, the power gap between the two sides couldn't be too large.
If Zhou Tian hadn't appeared, it was very likely that the NPCs could successfully ambush a group of monsters when the opportunity arose.
However, it was clear that Zhou Tian would not give them such an opportunity. Therefore, upon seeing the NPCs, Zhou Tian immediately set his plan in motion.