At that time, the idea Zhou Tian came up with to stimulate those NPCs was quite simple. The NPCs wanted to fight, didn't they? So he would create an environment for them, believing that when this group of NPCs encountered the Monster Force on the Mainland, they would likely end up fighting even without Zhou Tian's prodding.
The distance between the NPC Continent and the Mainland was vast, unless those NPCs on the NPC Continent were indeed preparing for a full-scale war with the monsters. Otherwise, the likelihood of a conflict arising between them from any aspect was not minor at all.
However, the main reason why there would be no conflict between the monsters on the Mainland and this group of NPCs was their great distance apart. And under such circumstances, if someday a tool brought these two forces together, it was estimated that even if the two forces had not previously thought about contacting each other, they would be unable to resist and would directly engage in combat!