Klaus and Irina approach Keld's camp; the two moons in the sky and so many stars make the night less dark, but the dunes prevent the group from noticing the couple approaching.
Also, as Keld and his fellows are so close to the campfire, the flames reduce their vision in the dark, allowing Klaus and Irina to get within a few hundred meters of them.
When the fairy sees the big cages in the group's wagons, she loses any pity she could have had for them, and only anger remains. "They are fucking slavers!"
"That's good, right?" A murderous glint passes through Klaus' eyes. "I can have a nice dinner, and as a bonus, we rid this land of such human trash."
Irina has never felt this strong before, and a part of her wants to use that power to help her people; That doesn't mean she wants to jump headlong into an old war, but killing slavers looks nice.
"I want to have fun too." She speaks to Klaus.