What does 'They hurried by him' mean in context? Who are 'they'?
"I will be back before dark," he told her harshly and, turning from her, he strode away towards the ruined sillhouette of the Colesberg kopje which stood out starkly, even through the stinking miasma of smoke and dust that hovered over the camp. Zouga might have been a wraith, a thing of air, invisible to human eyes. They hurried by him on the narrow track, or remained stooped over mill and cradle while he passed, without an inclination of head or even a casual glance, an entire community living for one thing only, completely absorbed and obsessed.
Source: Wilbur Smith's adventure novel, Men of Men: The Ballantyne