After successfully restraining the ghost, if other people's ghosts still appear nearby, based on Yang Jian's experience, it's either that the ghost is just a supernatural phenomenon and not the source, meaning the ghost will keep appearing unless the source is resolved.
The second possibility is that the ghost can restart or increase in number.
But looking at the situation here, the former seems more likely.
The fierce ghost holding the Black Umbrella is just a supernatural phenomenon; what truly needs to be dealt with might not be the ghost itself, but something else.
"The puddles on the ground, the ghost that appears only when it rains, the black umbrella..." Yang Jian pondered between these three.
This is the information Xiong Wenwen foresaw ten minutes ahead, and it's extremely valuable. Without his premonition, who knows how dangerous it would be to obtain this information, but now they can stand in a safe place and think about it slowly.