"...how charming."

"That is bizarre and worrying."

"So they... literally never stay more than a year?"

Shrug.

"We should definitely look into this."

"Could someone have cursed it? Is that a thing a curse can do?"

    "Some people say You-Know-Who cursed the position," Lavender Brown says in a conspiratorial tone.

"...why does You-Know-Who care?"

    She shrugs.

"People who have less consistent education in Defense are less able to defend against him?"

"But are also less able to join him, I'd expect."

"And Defence is more about dark creatures anyway."

"Then why is it called Defense Against the Dark Arts?"

"There is the occasional jinx and counter-jinx, but that's more for older years and students who want to follow a career in Defence, like Aurors, have to study much more anyway," says Percy, leaning in their direction after hearing some of their conversation. "A Hogwarts education is not enough to stand up to You-Know-Who, and If you see a Dark Wizard like that you should just apparate away, not fight."

"Apparate?"

"A magical technique to instantaneously relocate elsewhere."

"Teleport," she translates.

"We can teleport?"

"Yeah!"

"You need to be seventeen to get a licence, though."

"What happens if you do it without a license?"

"Well, if you haven't trained it yet under supervision you might splinch—leave parts of yourself behind."

"...Oh."

"It's hard to do even for seventeen-year-olds, people younger than that don't have enough magic control for it."

"Is magic control a skill or does it develop as you grow up?"

"A little bit of both."

"So it's like--muscles, where exercise helps but puberty also helps? Is that why we start at eleven?"

"Yeah, that's about right."