User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-4902593-20130914145422/@comment-10750309-20130918145555

Speaking of Nico, do you think Gaea somehow told him something while he was being transported back to the mortal world? Maybe its about leading the five (and Coach Hedge) to the House of Hades. Maybe Gaea made an agreement with him about something OR maybe she has shown something to Nico, that will happen if he does not cooperate, which explains why he kinda hesitated on promising Percy to lead the rest of the crew to the HoH (please read third line of the Prophecy of Seven).