To be fair, the banister doesn't actually exist to either of them at the moment. Dreams are a little more flexible than reality- so they really are sitting at a dock and the rest of the party goers will see them sitting on a banister. Simple really. Also Zagreus will find that he's no longer covered in cotton candy detritus. You're welcome.

"The rift didn't do me any favors. What about you?" Because if he's talking about rift powers, chances are he's got one or two.