The quote emphasizes the swift and decisive nature of Baxter's movement from the second to the first floor. The choice of the word 'descend' is intentional, highlighting the immediate and purposeful action taken by Baxter, rather than any slow or uncertain progression.
In the context of P.G. Wodehouse's "Leave It to Psmith," this description captures the character's focus and determination. It suggests that Baxter does not linger or second-guess himself; instead, he moves confidently, which reflects his character and the assertive dynamics within the narrative.