Grawp came lurching around the corner

Grawp came lurching around the corner of the castle; only now did Harry realize that Grawp was, indeed, an undersized giant. The gargantuan monster trying to crush people on the upper floors turned around and let out a roar. The stone steps trembled as he stomped toward his smaller kin, and Grawp’s lopsided mouth fell open, showing yellow, half brick-sized teeth; and then they launched themselves at each other with the savagery of lions.

“RUN!” Harry roared; the night was full of hideous yells and blows as the giants wrestled, and he seized Hermione’s hand and tore down the steps into the grounds, Ron bringing up the rear. Harry had not lost hope of finding and saving Hagrid; he ran so fast that they were halfway toward the forest before they were brought up short again.

The air around them had frozen: Harry’s breath caught and solidified in his chest. Shapes moved out in the darkness, swirling figures of concentrated blackness, moving in a great wave towards the castles, their faces hooded and their breath rattling…

Ron and Hermione closed in beside him as the sounds of fighting behind them grew suddenly muted, deadened, because a silence only dementors could bring was falling thickly through the night, and Fred was gone, and Hagrid was surely dying or already dead…

“Come on, Harry!” said Hermione’s voice from a very long way away.

“Patronuses, Harry, come on!”

He raised his wand, but a dull hopelessness was spreading throughout him: How many more lay dead that he did not yet know about? He felt as though his soul had already half left his body….

“HARRY, COME ON!” screamed Hermione.

A hundred dementors were advancing, gliding toward them, sucking their way closer to Harry’s despair, which was like a promise of a feast…

He saw Ron’s silver terrier burst into the air, flicker feebly, and expire; he saw Hermione’s otter twist in midair and fade, and his own wand trembled in his hand, and he almost welcomed the oncoming oblivion, the promise of nothing, of no feeling…

And then a silver hare, a boar, and fox soared past Harry, Ron, and Hermione’s heads: the dementors fell back before the creatures’ approach. Three more people had arrived out of the darkness to stand beside them, their wands outstretched, continuing to cast Patronuses: Luna, Ernie, and Seamus.

“That’s right,” said Luna encouragingly, as if they were back in the Room of Requirement and this was simply spell practice for the D.A. “That’s right, Harry…come on think of something happy…”

“Something happy?” he said, his voice cracked.

“We’re all still here,” she whispered, “we're still fighting. Come on, now….”

There was a silver spark, then a wavering light, and then, with the greatest effort it had ever cost him the stag burst from the end of Harry’s wand. It cantered forward, and now the dementors scattered in earnest, and immediately the night was mild again, but the sounds of the surrounding battle were loud in his ears.

“Can’t thank you enough,” said Ron shakily, turning to Luna, Ernie, and Seamus “you just saved–”

With a roar and an earth-quaking tremor, another giant came lurching out of the darkness from the direction of the forest, brandishing a club taller than any of them.

“RUN!” Harry shouted again, but the others needed no telling; They all scattered, and not a second too soon, for the next moment the creature’s vast foot had fallen exactly where they had been standing. Harry looked round: Ron and Hermione were following him, but the other three had vanished back into the battle. “Let’s get out of range!” yelled Ron as the giant swung its club again and its bellows echoed through the night, across the grounds where bursts of red and green light continued to illuminate the darkness.

“The Whomping willow,” said Harry, “go!” Somehow he walled it all up in his mind, crammed it into a small space into which he could not look now: thoughts of Fred and Hagrid, and his terror for all the people he loved, scattered in and outside the castle, must all wait, because they had to run, had to reach the snake and Voldemort, because that was, as Hermione said, the only way to end it –

He sprinted, half-believing he could outdistance death itself, ignoring the jets of light flying in the darkness all around him, and the sound of the lake crashing like the sea, and the creaking of the Forbidden Forest though the night was windless; through grounds that seemed themselves to have risen in rebellion, he ran faster than he had ever moved in his life, and it was he who saw the great tree first, the Willow that protected the secret at its roots with whiplike, slashing branches. Panting and gasping, Harry slowed down, skirting the willow’s swiping branches, peering through the darkness toward its tick trunk, trying to see the single knot in the bark of the old tree that would paralyze it. Ron and Hermione caught up, Hermione so out of breath that she could not speak.

“How – how’re we going to get in?” panted Ron. “I can – see the place – if we just had – Crookshanks again –”