“This way!” Harry yelled, and still shooting Stunning Spells at the advancing goblins, he sprinted toward the blind dragon.
“Harry—Harry—what are you doing?” cried Hermione.
“Get up, climb up, come on—”
The dragon had not realized that it was free: Harry’s foot found the crook of its hind leg and he pulled himself up onto its back. The scales were hard as steel; it did not even seem to feel him. He stretched out an arm; Hermione hoisted herself up; Ron climbed on behind them, and a second later the dragon became aware that it was untethered.
With a roar it reared: Harry dug in his knees, clutching as tightly as he could to the jagged scales as the wings opened, knocking the shrieking goblins aside like skittles, and it soared into the air. Harry, Ron, and Hermione, flat on its back, scraped against the ceiling as it dived toward the passage opening, while the pursuing goblins hurled daggers that glanced off its flanks.
“We’ll never get out, it’s too big!” Hermione screamed, but the dragon opened its mouth and belched flame again, blasting the tunnel, whose floors and ceiling cracked and crumbled. By sheer force, the dragon clawed and fought its way through. Harry’s eyes were shut tight against the heat and dust: Deafened by the crash of rock and the dragon’s roars, he could only cling to its back, expecting to be shaken off at any moment; then he heard Hermione yelling, “Defodio!”
She was helping the dragon enlarge the passageway, carving out the ceiling as it struggled upward toward the fresher air, away from the shrieking and clanking goblins: Harry and Ron copied her, blasting the ceiling apart with more gouging spells. They passed the underground lake, and the great crawling, snarling beast seemed to sense freedom and space ahead of it, and behind them the passage was full of the dragon’s thrashing, spiked tail, of great lumps of rock, gigantic fractured stalactites, and the clanking of the goblins seemed to be growing more muffled, while ahead, the dragon’s fire kept their progress clear—
And then at last, by the combined force of their spells and the dragon’s brute strength, they had blasted their way out of the passage into the marble hallway. Goblins and wizards shrieked and ran for cover, and finally the dragon had room to stretch its wings: Turning its horned head toward the cool outside air it could smell beyond the entrance, it took off, and with Harry, Ron, and Hermione still clinging to its back, it forced its way through the metal doors, leaving them buckled and hanging from their hinges, as it staggered into Diagon Alley and launched itself into the sky.