"His mind and mentality can change." Percy shot back, "He's retaining information, he's remembering things he's being told after death-- all ghosts do... the only difference is that he doesn't grow old, he doesn't touch. I mean-- It's just like having him here with us, it's the next best thing." Percy would take it over having nothing at all. It was the last desperate cling to the brother he was thoroughly convinced he killed.