User blog comment:SayuriDarling/The Mark of Athena Official Discussion/@comment-5301337-20121008025247/@comment-4649443-20121009064439

Yeah. 2 things I noticed that made it seem more grown-up: First, Hazel's "schist" reference. Second, when Frank said "what you did--I mean didn't do" when he found Percy and Annabeth in the stables, I think he might be implying that they had--well, you know what I mean.