Question

Arthur stood before the grand mahogany desk of the municipal clerk, his spine aligned with the rigid correctness that had defined his thirty years of civil service. Outside, the rain beat a relentless, rhythmic tempo against the high windows, mirroring the orderly ticking of the grandfather clock in the corner. He had spent the morning drafting a meticulous memorandum regarding the misuse of office stationery, citing three distinct sub-sections of the municipal code. 'There was a place for everything,' he often remarked to his silent reflection in the hallway mirror, 'and everything in its place.' Yet, as he reached into his breast pocket to retrieve his reading glasses, his fingers brushed against a small, crumpled envelope postmarked from a town he claimed to have forgotten. His hand paused. For a fraction of a second, his immaculate posture faltered, his shoulders dropping into a curve that suggested a heavy, unwritten history. He did not pull the letter out; instead, he pushed it deeper into the silk lining, his face hardening into an expression of even severer discipline. When the clerk finally looked up, Arthur greeted him with a voice that was perfectly dry, demanding an audit of the third-quarter ledger with an intensity that seemed almost desperate, as if the columns of numbers could construct a wall high enough to keep his own memories at bay.

In the passage, Arthur’s transition from physical vulnerability while touching the envelope to a 'perfectly dry' and 'desperate' demand for an audit serves what narrative function?