There are a few motifs in this section, like zombies, exile, and unnatural time. The brown fog of a winter dawn seems unnatural because of the colors (brown = pollution?) and the hour (dawn) doesn’t connote a busy time. And yet there is a large crowd flowing over the London Bridge, a crowd undone by death, who simply sigh and breathe as they walk across the bridge. Each man’s eyes are fixated before their feet, almost like they’re mindlessly traveling from somewhere, a place that that they may have been exiled from and can no longer stay in. Which results in this zombie-like journey.