User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-3146930-20130601104422/@comment-94.27.131.238-20130601163745

Yes, I was talking about the bluish light, which could only be seen near Percy's arm. That's why I was thinking the blue flood is water. And the white glow which surround Annabeth's head cames from before them (from the doors, couse next to the doors can be seen white glow too.)