As you touch the page, the simple truth solidifies in your heart. This echo isn’t a sentient thing. It is magic stripped away from Princess Luna by the Elements of Harmony. An echo of her jealousy and pain, and you feel the Princess of the Moon deserves a chance to put her past behind her. The day was saved, the princess rescued by Twilight Sparkle and her friends. You want it to stay that way.
In reaction to your feelings, the page slips into your grasp. The shadowy remnant of Nightmare Moon fades away like a shadow under a lantern light. You are able to clutch the page, and feel that its magic is dormant, at least for now. Perhaps you can find out more about this strange magic back in town, but for now, Caramel Malt finally expresses a desire to go back and you wholeheartedly agree.