The Doctor hopped down the steps from the TARDIS console, landing in front of the couch Amy was huddled up on. She was ready a very thick hardcover, the paper jacket previously removed.

"What book is that?"

"Harry Potter and the Order of The Phoenix."

"Oh, that's a good one. I was there."

"What? Does that mean that these books are real?"

"Well... It's not entirely fiction..."

"So witches and wizards are real? I knew it! Once, when I was 11, we had a substitute teacher and I was so sure she was a witch. I swear, I even saw her wand in her bag."

"You went poking through your teacher's bag?"

"... That's not the point. Now explain, time man!"

"Ah... Okay. First off, witches and wizards are not real. There were similar people, the Carrionites. Magic, it's just like science except that it uses words instead of numbers. Shakespeare was there. But anyway, they're gone now, sort of. Well, they're actually in that trunk over there." He said, gesturing to a corner.

"So you've met Shakespeare and you've got witches trapped in a box."

"No! They're entrapped in a glass ball inside the box. Ha, a box inside another box!" he chuckled. Amy rolled her eyes.

"So what do you mean you were there?"

"One day Jo Rowling decided to take a holiday. Outside her flat there were some woods where she like to take walks. And in came the Dementors."

Amy looked less than impressed.

"Okay, out of all the things in the wizarding world that I was hoping for, Dementors were not one of them."

"In my defense, I can't exactly pick and choose. The Dementors aren't actually called Dementors, but their actual name is impossible to pronounce. It's actually more of an idea, really. I suppose it's like a shade of green, but with more dimensions." Amy stared blankly. "Wibbly wobbly, timey wimey. But the name Joanne Katherine Rowling used came from, 'Ah, what was that, how demented.'"

"Uh huh..."

"You remember how the Weeping Angels worked? They fed on potential energy. But the Dementors, they feed on residual energy. That's why the characters in the books have to come up with the happiest memory they have. Sad, sorrowful, angry memories have more substance than happy ones; in the same way that it takes more muscles to frown. The happy memory practically starves the poor thing. And the Patronuses do basically the same thing, but that's more from an environmental standpoint because they're extremely sensitive to light. And heat. Although Patronuses don't actually exist, she engineered them on the same basic concept."

" Back up... 'Ang on, you said 'poor thing'. It's trying to suck out your soul."

"Yes, well... That can happen. As the most powerful memories get sucked away everything else begins to disperse like smoke and the individual's actual consciousness has been absorbed."

"I'm more hung up on the adjective here; say it with me: 'poor'. In what way is the predator to pitied here?"

"Because they're just like any other creature in the universe dependent on finding sources of raw energy. People are smart, they know what areas to stay out of. The Dementors can't help what they do, it's by nature. A survival instinct, if you will. Now there are very few left. I assume you know of the Bermuda Triangle?"

"So that's what happens there. People get lost in fog and have their souls erased."

"Essentially, yeah."

"Lovely. Pardon me, I must go find some sort of mind bleach to get this out of my head. I don't think I'll ever sleep again otherwise."

"8th door on the left." He answered with a smug grin. Amy scoffed at him and took off down the corridor.