Although Joan had recently woken up, after eating and feeding her son, she fell back asleep. Toz didn't mind and let her rest alone since he had gotten a few things to think about.
Although a realm war sounded like something out of a storybook since it had been several ages since one last appeared, it did explain the reason Toz had encountered several demon attacks that could have been devastating for the human realm. With another perspective, he also realized that the Scorched Earth Rat infestation might have been started by demons.
The rats had seemingly appeared from out of nowhere, and until Toz stumbled upon them, no one had noticed or paid extra attention to them. If they had been allowed to spread unchecked, wouldn't they have gotten too strong to stop by the time the war officially started?