They stood up mocking the graceful gait of the pheasant and partridge, yet they stumble themselves; their own long trouser hems become a heavy burden and humiliate them.

In classical poetry, the pheasant and partridge are admired for their naturally graceful and delicate gait. The poet gently scoffs at the arrogant who mock others' effortless grace; attempting to show off their own grandeur, they end up stumbling on their very first step. The overly elaborate hems of their pompous garments turn into a literal trap, tripping them up and exposing the hollow weight of vanity.