كَالِانْتِقَالِ مِنْ طُولِ النِّجَادِ إِلَى طُولِ الْقَامَةِ
As the movement from the length of the sword strap to the length of the person's stature.
The listener first understands the lexical content of “ṭawīl al-nijād.” Through a recognized convention, the listener then infers the wearer's height. The sign is mentioned, and the characteristic it indicates becomes the speaker's rhetorical target.
This inference depends on the strap's length being understood as a sign of stature. In a setting where actual sword equipment is being inspected, the same words may convey only literal information; context and intention determine the use.