User blog comment:Hermione Chase/"The Blood of Olympus" Expectations/@comment-24697901-20140627121728/@comment-25277802-20140808193959

Most likely because of the whole Athena/Poseidon enmity - if Athena found out that Annabeth was found dead with Percy and vice versa then there would be a whole lot of ugly between the Olympians and possibly the start of a war (you know like with the Lost Hero wolf house bit with the Greeks and Romans).