He stretched his right hand out in front of him—the hand with the missing finger. He gripped the dagger very tightly in his left hand and swung it upward.
Harry realized what Wormtail was about to do a second before it happened—he closed his eyes as tightly as he could, but he could not block the scream that pierced the night, that went through Harry as though he had been stabbed with the dagger too. He heard something fall to the ground, heard Wormtail’s anguished panting, then a sickening splash, as something was dropped into the cauldron. Harry couldn’t stand to look… but the potion had turned a burning red; the light of it shone through Harry’s closed eyelids…
Wormtail was gasping and moaning with agony. Not until Harry felt Wormtail’s anguished breath on his face did he realize that Wormtail was right in front of him.
“B-blood of the enemy… forcibly taken… you will… resurrect your foe.”
Harry could do nothing to prevent it, he was tied too tightly… Squinting down, struggling hopelessly at the ropes binding him, he saw the shining silver dagger shaking in Wormtail’s remaining hand. He felt its point penetrate the crook of his right arm and blood seeping down the sleeve of his torn robes. Wormtail, still panting with pain, rumbled in his pocket for a glass vial and held it to Harry’s cut, so that a dribble of blood fell into it.
He staggered back to the cauldron with Harry’s blood. He poured it inside. The liquid within turned, instantly, a blinding white. Wormtail, his job done, dropped to his knees beside the cauldron, then slumped sideways and lay on the ground, cradling the bleeding stump of his arm, gasping and sobbing.
The cauldron was simmering, sending its diamond sparks in all directions, so blindingly bright that it turned all else to velvety blackness. Nothing happened…
Let it have drowned, Harry thought, let it have gone wrong…
And then, suddenly, the sparks emanating from the cauldron were extinguished. A surge of white steam billowed thickly from the cauldron instead, obliterating everything in front of Harry, so that he couldn’t see Wormtail or Cedric or anything but vapor hanging in the air… It’s gone wrong, he thought… it’s drowned… please… please let it be dead…