User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-3146930-20130601104422/@comment-79.122.68.231-20130601111519

Actually my first idea was that the blue thing at Percy's and Annabeth's foot is some magic water. It is going up on their foot, and look, Percy has a bluish "glow" on his arm (Annabeth doesnt). Like he is geting strength from the water. What do you think? :)