"Megan!" Nick blurted, after nearly jumping out of his skin (or someone's skin, at any rate). As the start turned to relief, Nick realized what Megan would be seeing, and started to sputter, but Megan seemed calm, and stopped him. As she spoke, he noticed that she looked quite well-dressed, with even Nick being able to tell that she was carrying an expensive leather purse.
"It's OK, Nick." She said, "Don't worry... the fact is, I'm not Megan." She seemed to let that sink in for a second, waiting to see the proverbial light bulb go on. "Yes, that's right, I'm you." She said, pulling the Amulet of Time out from under her blouse. "From the future."