I feel like what I've seen of the DPS that they would tell everyone in their path about the horde following them. That can cause conflict in itself. Belle's character would have to move because it would be impossible for her to survive a horde. Also Acro's. I don't know what she'd do about a horde. Best case scenario she will be trapped inside her sewer for awhile and can't scavenge til they are gone but a good amount of them would stay behind of the horde making it harder.