Even though these monsters were only as strong as elite monsters, clearing such quests was not an easy task. After all, nobody knew whether all of the NPCs on the streets were impersonated by monsters or only a portion of them.
They wouldn't want to risk the possibility of being charged with a crime of attacking a resident NPC. This could cause their reputation to be swept away.
Therefore, the Quan Zhen Sect split ways to find NPCs which they were more familiar with.
Even so, the Quan Zhen Sect didn't spend much time wandering and idling around the streets so there were only a few NPCs whom they were more familiar with. Shortly after, everyone managed to clear the quests given by the NPCs they were familiar with. Eventually, everyone gathered in front of a fruit stall without prior consultation with one another.
The old man from the fruit stall was probably the only NPC everyone spoke to on the streets other than the ones they were more familiar with.