Mrs. Zhang was sneaking around the fish pond, having not yet found the chance to poison it, when Jia Yu noticed something was off. Jia Yu shouted loudly, scaring Mrs. Zhang into turning and running.
Therefore, the scene that Su Yunjin and the others later saw came about. Initially, Jia Yu just felt something was off about Mrs. Zhang, seeing her turn to run.
Jia Yu felt even more that there was something wrong with Mrs. Zhang.
That's why he chased after her.
While they were chasing Mrs. Zhang, Su Yunjin took her elder sister Su Ningxiu to check the fish pond, to see if Mrs. Zhang had done anything. Su Yunjin walked into the fish pond.
And found nothing unusual.
Meanwhile, Mrs. Zhang had already been caught by Jia Yu and Gu Ya and brought back. Mrs. Zhang sat down hard on the ground, shouting loudly outside, "What are you doing to me? Just because there are many of you, you bully me alone?"