User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-212.198.241.177-20130408194158/@comment-4531192-20130409152838

It probably goes something like this:

Rick Riordan: I need a way to make Percy and Annabeth get captured by Gaea...

Some random author: How about you make them fall off a cliff to what seems like their imminent doom?

Rick Riordan: Just what I needed.