This was always one of the most powerful moments of the books for me. When he and Annabeth both had to do this... bear with the pain of that. It was heartbreaking for them and for the readers, but at the same time, it gave them something... I think that perhaps it strengthened them both. I absolutely HATE that the grey streak of hair that Perce and Annabeth both got was never mentioned again. And that so many fan artists forget to add it in.