User blog comment:SayuriDarling/The Mark of Athena Official Discussion/@comment-25044414-20121007062341/@comment-25044414-20121008092839

Zoe -- Oh my, maybe! I've always thought I had a twin separated from me at birth. Lol kidding. Yeahhh, especially since he's also almost ventured into the Tartarus! But the plan thing could be a little creepy and sad. If he knew, I think Nico would have tried to find a way to help them or something, idk.

Anon -- That could be! I wasn't really sure if the whole jumping into Tartarus thing was already the choice/sacrifice that Juno/Hera (and Mars) says Percy has to make, so it could still be shown in the next books.. Oh, gods, I hope not. :(