Although NPCs don't have as many conveniences as players, nobody can guarantee that if the deity decides to make some minor moves, it won't enhance the strength of those NPCs. If the strength of these NPCs suddenly increased, even if Zhou Tian does not face a direct threat to his life, he would undoubtedly encounter some troubles under their calculative tactics.
As such, although the strength in Zhou Tian's hands is not yet fully stabilized and these NPCs haven't taken any extreme actions, Zhou Tian, due to previous actions taken by the players, had already made up his mind to deal with these NPCs in advance no matter what.
As a result, not long after Zhou Tian had this thought, his Bearman Army quickly mobilized. Before the NPCs could understand what was happening, the Bearman Army had already surrounded their castles one by one.