Leht was giving as much as a damn as Anna through their whole trip. He was just tagging along to get his reward, so he was pleased with their new scythe wielding companion. Sin was straight to the point, and made things go along swimmingly. He didn't really pay attention to the angel and sins babble, and only listened to certain keywords.
Meanwhile, Theresia was knee deep in shit with the other angels, trying to defend the world from the phantasms. The only they she could do was believe that the group would stop the flow of phantasms, as that was the only option of winning the war anyway.