Amanda and Charlier were shocked at what Din told them after he returned. Even though he hadn't ventured deep into the wasteland, he saw enough to make him sick. The ground was covered by dry blood and a few chewed-up rat corpses, with signs of other rats passing through and stirring up the blood before it dried up.
The rats they had seen here and there during the day weren't as ordinary as they seemed, apparently. If the signs and tracks paving a way through the wasteland were anything to go by, the rats were numerous, violent, cannibalistic, and a danger to other beings.
Considering that the dusty rats were the only thing they had seen in the wasteland, a rising suspicion about the connection between the two grew in their hearts. But they still needed to wait for Toz to wake up and listen to what he had to say.