The part of speech or figure of speech represented here is Imagery. The narrator does a great job of creating a very vivid image of the exact movements or ambulation of the goose.
The key words here are:
Both adjectives are efficient are qualifying the movement of the goose.
Imagery is a type of visual symbolism or figurative language that conjures a mental image or other types of sense sensations, most commonly in literary works, but also in other activities such as psychotherapy.
A narrator is someone who narrates stories. The narrator decides the story's point of view in a work of fiction.
The narrative is considered to be in the first person if the narrator is a complete participant in the story's action. A third-person narrative is one given by a narrator who is not a character in the story.
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