You spot Applejack on the highest beam, talking to her brother about something. He nods his head and walks back towards the main house. Maybe he forgot something. There was lots of big important building things scattered around. It looked dangerous but Applejack didn't seem scared of being so high up. Oh, you should go say hi and deliver that letter now! You fly down, her letter already in your mouth. She doesn't see you coming. You land behind her and tap her butt with your hoof.