"Right, we can use those people to break the siege!" With their own strength insufficient to handle the threat from Zhou Tian and other NPC cities too busy with their own problems, the NPCs within the city naturally thought of those players at that moment.
Although players are naturally allies of NPCs, NPCs are NPCs after all, and players are players. No matter how intimate the two sides usually appear, in the hearts of those NPCs, they can't help but regard those players as outsiders.
Given such circumstances, when they encountered trouble, it's not surprising that NPCs thought of those players, whom they practically regarded as tools.
For those NPCs, getting those players to help is simply too easy. As long as they're willing to pay some supplies, those players will obediently come to help them fend off powerful enemies. In this process, they would likely suffer fewer losses compared to fighting monsters themselves.