He is laughing. "Wow. That was amazing. Okay -" Ister is going to make precisely the Moon prison Cam designed -

And here it is, Elf-friendly demonic arcologies.

They are kind of absurdly pretty, wow. He blinks admiringly for a little while. "Okay! Now, prisoners fetched and brought here, Cam gave you the specifics on precisely where, right? And dementors boxed and fetched and dropped off a distance away that is exceedingly inconvenient for them...."

"You're going to have to point me at the island," Treeleess says as they rocket back towards the Earth and around to the relevant edge of the Atlantic.

Gosh this is amazing. 

He points her at the island.

"...I don't see an island there."

"Well. That's going to be inconvenient. I'm going to have Ister make something on the island, check if you can see that..."

Ister should do that -

Ister makes the requested colorful smoke.

"Nope," says the fairy who never introduced himself.

"Let me see if I can get the outlines of it -" what if he just blankets the whole place in colored smoke -

"...There's a little there -"

Wider surrounding area -

"I can just grab everything in that radius?"

" - yeah, great, do that, if you move it out of the way of the magic I bet you'll be able to see it fine -"

"I'll pick it up, you stop the water from all falling in at once and make room for me to put it down -"

"Okay -"

The island of Azkaban and a considerable amount of surrounding ocean in a neat cylinder lift into the air. A similar quantity of water moves over to fill the gap; the island drops in the space left behind.

"Wow. Invisible island," comments the erstwhile nude fairy.

"I take it you can see it now?"

"Yeah. So we take apart the building and I take the humans to the moon, and the demon boxes the invisible monsters and she takes them to space?"

"Yep!" The Dementors are, of course; quite visible to him; they're also quite riled up.

The building comes apart in chunks, floor by floor. Humans are zoomed away from it and floated in the air away from the island.

Fairies are so cool. He wants Ister to make boxes, there, there and there - there, there, and there - over there....

Ister contentedly boxes horrifying nightmare creatures. Treeleess moves a box as soon as the first one appears. "Monster come with okay?" she asks.

It does. "Yep!" Box box box -

The boxes are lined up neatly in the sky. "How many of these things are there?" The prison is completely demolished now.

"Less than a hundred - " box box -

"I think that's all the prisoners?" asks the other fairy. "Is this all of them?"

Ister can make little models of any prisoners still in Azkaban -