Harry puts his back to the wall and slips into the shadows of The Library. He hears the voices approaching.
"Harry! Stay out of the shadows!" The Doctor yells.
He leaps into the light and fingers his wand. As soon as he's sure that the people coming aren't the type of Muggles he's supposed to hide from, he'll pull out his wand and make some light.
This is what I do with my life after defeating Voldemort? he thinks, not for the first time. Harry looks at the man who listens at the door. The Doctor is worth every monster. The door opens and in walks a group of people that look to be wearing spacesuits.
"Hello, goodbye! You really ought to leave. We're leaving, aren't we, Harry?" The Doctor says.
"Oh,no. We came all this way and we are not leaving," one of them says.
A small man with an obviously large ego comes over to us and hands us some papers.
"It is you who should leave. This is my expedition," the man says.
The Doctor reads the papers in his hand, takes the ones in Harry's hand from him and throws them both to the floor in pieces. Harry sits on the floor but is sure to avoid the shadows this time. He shouldn't have been so careless before.
A girl screams loudly. Everyone runs to the sound. When they arrive, they find a skeleton devoid of any flesh that seems long dead lying on the ground, but it's wearing the clothing of one of the group that came in after Harry and The Doctor arrived. It is then that Harry knows what they are dealing with.
"That's the first body we've seen here," one of the people says. Harry never bothered to learn their names.
He pulls out his wand and says, "Lumos."
"What's that?" the same person asks.
"Light. Now we should go back to where we were. I'll explain there," The Doctor says. They agree and follow him. WHile he explains the Vashta Nerada to them, Harry tries to recall how to defeat them. He knows all about them. They are the descendants of Dementors, and they're vicious. They chill the air and bring darkness, but rather than devour your soul, they eat your flesh. Harry hoped he could be useful. The soft glow of his wand forces the shadows away from his spot.
intergalactic Auror, he thinks, what a great job this turned out to be. Harry is brought back to the present by The Doctor's voice.
"I'm sorry. I'm so terribly sorry," he says.
Harry turns immediately. He knows what that means.
"what?" the man he's talking to asks.
"You have two shadows," The Doctor says.
Everyone backs away from the man with two shadows. Harry stares at them until his eyes blur. A shadow starts to spike. That's the one.
"Expecto Patronum!" Harry shouts. The shadow hisses and flees.
"How did you do that? They never leave," The Doctor says in surprise.
"They will for me. Now, come on. we have to go!" Harry says.
They all run through the hallways until they reach the Tardis. They all get in and shut the door behind Harry.
"It's bigger-"
"On the inside, yes. We need to leave," The Doctor says impatiently.
The Tardis whooshes through space and lands inside of a spaceship. The passengers that don't belong step off and thank the Doctor repeatedly. Then the door is closed and the Tardis sails into the stars.
"We've witnessed the fall of The Library, haven't we, Doctor?" Harry asks.
The Doctor doesn't reply for a moment.
"Yes. The planet will be quarantined and no one will ever go there again," he finally says. Out of respect, they don't speak for a long time.