"I think it may be a good idea to stop for the night" Athene admitted as he closed the book he had and carefully slid it back into an empty space on one of the shelves, hoping as he did so that he had slipped it back in the right place.
"We can always try coming back to the Moon again" he continued as he looked over to see whether Thraen needed a hand with the books he was putting away, adding "And I can study the pearl in the meantime and try to work out when it next glows and send you a message via the senshi phone."
Once the books were all back in place Athene stepped back into the hallway and took the opportunity to unwrap the sash mask from his face and wind it back in place as he waited for Thraen, adding to the other once the door was shut on the library, sitting room or whatever the book-laden room was. "I'm not sure whether we need to be outside for the pearl to transport us back, since I think I was outside last time round" and the first time had been sort of different. He summoned his senshi phone and held out his other hand as he continued "I'm happy to try it here and see what happens though."
After all if it didn't work then they could always walk back outside.