Redsand Canyon (Nothing but) ashes...

Instead of going off to do her own thing, she followed after him.

Glaukos couldn't tell if she was doing it out of spite (which was likely the case) or duty (the idea makes him scowl a little harder); but whatever her reason, he doesn't say anything. He doesn't stop her, or speak during the tour.

This is his way of getting shit done. If she wanted conversation, he figures, that's what the civilians are for.