The image underscores the feeling of anxiety and tension in the passage.
In the passage, we can see that the characters are running out of time, as they need to finish a very important activity in a short period. This moment increases the tension of the sentence, which is highlighted by the massive entry of people into the library.
The arrival of these people highlights the image of movement, speed, and anxiety, leaving the passage with an even more tense and anxious tone.
The passage your question refers to is in the attached image.
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