Even though the Monster Horde had come to a stop in Jin's world, the assault on the town of Wecha had yet to conclude. While the shield generator was no longer under Peppers' control, its automated processes were doing an outstanding job against the Demon Rats' final push for the town.
Many of the militia were able to fight and hold the walls despite a few minor breaches. Any rats who broke through were handled by the Jacks. The rats in the sewers system were doing their best to dig a way out, yet whenever they managed to breach the surface, the women and children handled them in the same manner as they had done since the first wave.
Meanwhile, Sandy was rushing wherever she was needed to seal the entrance and put a stop to the flow of rats appearing. (At the same time temporarily strengthening the foundation so that when the System set off a blast, it would not break the entirety of the town.)