Luna went to the front door and peeked out; Twilight was still within sight, although soon she would need to turn a corner. Luna took a glance in the opposite direction to make sure nopony was watching, and, only seeing Pinkie Pie prodding at some flowers, set off to follow Twilight as stealthily as she could.
Going from piece of cover to piece of cover, Luna stalked Twilight throughout the town. Mostly she stuck to shadows and went unnoticed, as it was raining and most ponies were inside, but a few still saw her and were confused; after realizing it was Luna they would do a double-take, becoming even more baffled by what they were seeing.
Twilight went first to the town hall, where she had a boring conversation with Rarity about the decorations; apparently much had been ruined by the rain, though it would still be possible, albeit difficult, to have things ready. Heading to her next stop, Twilight muttered angrily under her breath, blaming herself for not having spread the word of the rain.
Twilight went from place to place, all around town, checking on the different ponies. Next to Fluttershy's cottage to check on her and her bird choir, then Sweet Apple Acres to check on Applejack and their food. Everywhere there were varying amounts of trouble caused by the rain, which still showed no sign of stopping, but nowhere was anything interesting said. If anything, what was strange was that neither Twilight nor her friends said anything at all about Celestia.
Some hours had passed, and it was becoming dark, Luna was beginning to realize that her stalking of Twilight was fruitless. Unfortunately the lack of anything significant failed to satisfy Luna's suspicion, but she understood that there was no point in continuing to follow Twilight. She went back to the library, disappointed; she would just have to wait until dawn to see what was going on with Celestia.
Back at the library, Luna browsed the bookshelves, looking for something that seemed worth reading. In the end she chose a book about the movement and phases of the moon; she already knew everything it would contain, but was curious to see just how much the average pony could learn about it. She only read it for perhaps half an hour before falling asleep.