Answer:
Because it shows how Hyde continuously plagues Jekyll.
Step-by-step explanation:
The excerpt shown above presents elements of Gothic literature, through a narrative with a strong sense of horror and fear, natural from this type of literature, in addition, it presents an ominous, uncomfortable, agonizing tone that shows how Jekyll is constantly being tormented and tortured by Hyde, without showing a minute of tranquility and fullness. However, the excerpt gives the feeling that evil will not hide forever and that everything is always revealed.