Cries of pain could be heard from the city while the beast horde hunted all the people living inside. It was an unavoidable fate since those beasts hated them and Wyba didn't plan to forbid them to attack.
She had stopped giving orders to them, but for those beasts that attack to the city was the vengeance for those beasts that had died without reason and they had waited for so long for that moment, so they didn't need any order to hunt the inhabitants of the city.
Yale knew that although all the people had marks on their souls, not all of them were truly evil and were just forced to obey by the True Empire, but he didn't have time to kill all of them personally to let his sword judge their souls. Moreover, that city was the one who attracted the hatred of the beasts, and they were paying the consequences.