Why might the author use the word pouring to describe the snake action in paragraph 91?

The author used the word 'pouring' is to let the reader imagine what the snake is doing.
This is a visually descriptive or figurative language especially in a literary work.
This action of 'pouring' describes the snake's action because the snake is in the basket and the decision used means that the snake is coming in and out of the basket.
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