This idea was just Slytherin through my mind.
"Avada Kedavra!"
A green bolt of light streaked from a cloaked figure and struck Cedric in the chest. Harry turned and watched as the other champion of Hogwarts flew backwards and fell to the ground.
The bespectacled boy ignored the flashes of pain in his scar and dropped down to the Hufflepuff's side. He gripped the older boy's shoulder and screamed.
"No! No! Cedric!" Hot tears fell from his face, landing on the same spot as the curse did moments before. Harry looked up and glared fiercely at the man carrying the bundle.
"Damnit, Voldemort! If he comes back as a vampire, then I will Crucio you into oblivion!"
Teehee.