What is most likely the author’s reason for beginning the story in medias res with Rikki being swept away by the flood (paragraphs 3-4)?

One day, a high summer flood washed him out of the burrow where he lived with his father and mother, and carried him, kicking and clucking, down a roadside ditch. He found a little wisp of grass floating there, and clung to it till he lost his senses. When he revived, he was lying in the hot sun on the middle of a garden path, very draggled indeed, and a small boy was saying, "Here’s a dead mongoose. Let’s have a funeral."

"No," said his mother, "let’s take him in and dry him. Perhaps he isn’t really dead."

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