How couldn't Jiang Pengji know that it was dangerous to let the woman who had crossed dimensions go unchecked?
For each day that this potential pitfall stayed alive was one more day that Jiang Pengji would have to face the constant threat of assassination. Not only that, but the people around her might also be implicated.
A female inter-dimensional traveler with no scruples. A greedy system that wanted the world to be thrown into chaos and also harbored a myriad of schemes. These two fellows even harbored malice for Jiang Pengji that no one else knew about... Solely based on this point, Jiang Pengji could not allow them to stay alive and healthy. That would give her even more stress!
If the roots weren't pulled out with the weed, it would come back to life with the spring breeze.
However, she was a rational hunter and knew what to do to catch her prey smoothly.