Savannah frowned. "I wouldn't tell you to piss off and you can stay," she said. "In fact, you should stay." She stepped closer, smiling again. "This must be very confusing, but I can guarantee you that you are wanted here. The castle wouldn't have brought you here otherwise."
Still holding her broom in her left, she gestured toward the castle. "Why don't we go inside and you can get settled? When did you arrive? And from where?" she asked. "Actually that probably sounds very strange but I promise you that I'm not crazy and I'm not trying to trick you."
Savannah took a deep breath. "The thing is- that the wizarding world went to hell and everyone died right around 2030. It's now 2038 and Hogwarts has decided that it wanted company and it's bringing people back. Your name... it's familiar." She thought it was, one of the bad guys, she was pretty sure but then the castle didn't bring bad guys. Okay maybe Lucius Malfoy, but he was harmeless. And then she remembered. "You're a werewolf, right? There's another werewolf, and there's a potion called the Wolfsbane that makes you keep your human mind when you transform, so that should make things easier. I'm sure you must be full of questions though. Go right ahead, ask me anything."