Eliezer Yudkowsky - Harry Potter and the Methods of Rationality

Only a single soldier now stood between them and Harry, a Slytherin boy named Samuel Clamons, whose hand was clenched white around his wand, held upward to sustain his Prismatic Wall. The boy's breathing was coming rapidly, but his face showed the same cold determination that lit the eyes of his general, Harry Potter, who was standing behind the Prismatic Wall at the dead end of the corridor next to an open window, with his hands held mysteriously behind his back.

The battle had been ridiculously difficult, for the enemy being outnumbered two-to-one. It should have been easy, Dragon Army and the Sunshine Regiment had melded together easily in practice sessions, they'd fought each other long enough to know each other very well indeed. Morale was high, both armies knowing that this time they weren't just fighting to win for themselves, but fighting for a world free of traitors. Despite the surprised protests of both generals, the soldiers of the combined army had insisted on calling themselves Dramione's Sungon Argiment, and produced patches for their insignia of a smiling face wreathed in flames.

But Harry's soldiers had all blackened their own insignia - it didn't look like paint, more like they'd burned that part of their uniforms - and they'd fought all through the upper levels of Hogwarts with a desperate fury. The cold rage that Draco sometimes saw in Harry had seemed to trickle down into his soldiers, and they'd fought like it hadn't been play. And Harry had emptied out his entire bag of tricks, there'd been tiny metal balls (Granger had identified them as "ball bearings") on floors and staircases, rendering them impassable until cleared, only Harry's army had already practiced coordinated Hover Charms and they could fly their own people right over the obstacles they'd made...

You couldn't bring devices into the game from outside, but you could Transfigure anything you wanted during the game, so long as it was safe. And that just wasn't fair when you were fighting a boy raised by scientists, who knew about things like ball bearings and skateboards and bungee cords.

And so it had come to this.

The survivors of the allied forces had cornered the last remnants of Harry Potter's army in a dead-end corridor.

Weasley and Vincent had rushed Longbottom at the same time, moving together like they'd practiced for weeks instead of hours, and somehow Longbottom had managed to hex them both before falling himself.

And now it was Draco and Granger and Padma and Samuel and Harry, and by the looks of Samuel, his Prismatic Wall couldn't last much longer.

Draco had already leveled his wand at Harry, waiting for the Prismatic Wall to fall of its own accord; there was no need to waste a Breaking Drill Hex before then. Padma leveled her own wand at Samuel, Granger leveled hers at Harry...

Harry was still hiding his hands behind his back, instead of aiming his wand; and looking at them with a face that could have been carved out of ice.

It might be a bluff. It probably wasn't.

There was a brief, tense silence.

And then Harry spoke.

"I'm the villain now," the young boy said coldly, "and if you think villains are this easy to finish off, you'd better think again. Beat me when I'm fighting seriously, and I'll stay beaten; but lose, and we'll be doing this all over again next time."

The boy brought his hands forward, and Draco saw that Harry was wearing strange gloves, with a peculiar grayish material on the fingertips, and buckles that stapped the gloves tightly to his wrists.

Beside Draco, the Sunshine General gasped in horror; and Draco, without even asking why, fired a Breaking Drill Hex.

Samuel staggered, he let out a scream as he staggered, but he held the Wall; and if Padma or Granger fired now, they would exhaust their own forces so badly that they might just lose.

" Harry! " shouted Granger. " You can't be serious! "

Harry was already in motion.

And as he swung out the open window, his cold voice said, "Follow if you dare."

The icy wind howled around them.

Draco's arms were already starting to feel tired.

...It had developed that, yesterday, Harry had carefully demonstrated to Granger exactly how to Transfigure the gloves he was currently wearing, which used something called 'gecko setae'; and how to glue Transfigured patches of the same material to the toes of their shoes; and Harry and Granger had, in innocent childish play, tried climbing around the walls and ceiling a little.

And that, also yesterday, Harry had supplied Granger with a grand total of exactly two doses of Feather-Falling Potion to carry around in her pouch, "just in case".

Not that Padma would have followed them, anyway. She wasn't crazy.

Draco carefully peeled loose his right hand, stretched it over as far as he could, and slapped it down on the stone again. Beside him, Granger did the same.

They'd already swallowed the Feather-Falling Potion. It was skirting the edges of the game rules, but the potion wouldn't be activated unless one of them actually fell, and so long as they didn't fall they weren't using the item.

Professor Quirrell was watching them.

The two of them were perfectly, completely, utterly safe.

Harry Potter, on the other hand, was going to die.

"I wonder why Harry is doing this," said General Granger in a reflective tone, as she slowly peeled the fingertips of one hand off the wall with an extended sticky sound. Her hand plopped back down again almost as soon as it was lifted. "I'll have to ask him that after I kill him."

It was amazing how much the two of them were turning out to have in common.

Draco didn't really feel like talking right now, but he managed to say, through gritted teeth, "Could be revenge. For the date."

"Really," said Granger. "After all this time."

Stick. Plop.

"How sweet of him," said Granger.

Stick. Plop.

"I guess I'll find some truly romantic way to thank him," said Granger.

Stick. Plop.

"What's he got against you? " said Granger.

Stick. Plop.

The icy wind howled around them.

One might have thought it would feel safer to have ground under your feet again.

But if that ground was a slanted roof tiled with rough slats, which had rather a lot more ice on it than the stone walls, and you were running across it at a high rate of speed...

Then you would be sadly mistaken.

" Luminos! " shouted Draco.

" Luminos! " shouted Granger.

" Luminos! " shouted Draco.

" Luminos! " shouted Granger.

The distant figure was dodging and scrambling as it ran, and not a single shot hit, but they were gaining.

Until Granger slipped.

It was inevitable, in retrospect, in real life you couldn't actually run across icy slanted rooftops at a high rate of speed.

And also inevitably, because it happened without the slightest thought, Draco spun and grabbed for Granger's right arm, and he caught her, only she was already too far off balance, she was falling and pulling Draco with her, it all happened so quickly -

There was a hard, painful impact, not just Draco's weight hitting the rooftop but some of Granger's weight too, and if she'd hit just a little bit closer to the edge they could have made it, but instead her body tipped again and her legs slipped off and her other hand grabbed frantically...

And that was how Draco ended up holding onto Granger's arm in a white grip, while her other hand clenched frantically at the edge of the rooftop and the toes of Draco's shoes dug into the edge of a roof tile.

" Hermione! " Harry's voice shrieked distantly.

"Draco," whispered Granger's voice, and Draco looked down.