User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-4902593-20121022064940/@comment-5112532-20121024200419

^ GENIUS!!

So, Percy and Annabeth realize that one of them has to stay behind and close the Doors of Death, Percy volunteers but Annabeth says no, they argue. They open the doors, where the rest of the 7 are on the other side. Percabeth argue over who it is. FRANK volunteers and solders the door shut with his stick.