With the moderate speed that they were pushing their carriages at, it would only be cavalry that would have a chance of catching up. Soldiers couldn't maintain that pace for long – nor could villagers. Those that had not been given a place in a carriage needed to continually switch, and they were growing even more exhausted for it.
Of course, Vol's powers didn't extend as far as the villagers did . The System hadn't been merciful enough for that.
"They're mere serfs," Pandora sniffed. "They are the servants that the Elder thought them to be. If they have no use in combat, they have no use at all – at least not for you. You could quite happily be rid of them, if you wished."