[Since he seems disappointed with her answer, she tilts her head in thought, trying to decide if there's something she might have missed.]

Oh! No, it's not the rocks. I think there's little creatures or something in there. Lots of 'em. And... they're mean.

[She looks upset, realizing this really isn't helping at all. She turns her broom backwards, bristles behind her and facing up at a forty five degree angle, and she lounges back on it, her arms behind her head as she thinks.]