Tree-running's not as easy as it looks, especially when you're carrying someone. She'll be glad when they get back to the desert.
Though.
It's... nice, to be able to carry her sister like this. Maybe things will change.
"We have a week."
With the immediate business settled and the other two in position to keep an eye on developments, she feels confident in departing for a cave she knows a ways away. It's not hard to slip out, things being as they are. She blocks the cave's entrance and spreads down a cushion of sand to sit on, and focuses inwards, looking for the place where the beast lurks.
She's successful.
"You dare disturb my slumber?" a deep voice rumbles from behind her, sounding like sand scraping against stone.
"Alas, then, that we must work with the world as it is. You do have me. And I am stuck with you."
"Perhaps. But tell me. Are you truly content to sleep all the ages of the world away?"
"You are a fool if you think I will not outlive your entire system. You humans are gone in but a blink of an eye to me."
"Selfish and violent I do not deny, and do not view as points of shame. Short-sighted I contest, for if I was that, I would have long since given you free reign to utterly destroy my village. Treacherous likewise, for those deal fairly with me I have dealt fairly in return."