you, harry and cedric were Triwizard champions. When you 3 sped up for the Triwizard cup in front of y'all, you all teleported to a graveyard.. How odd?

then harry gets trapped by the scythe of the statue by who knows.. Then Peter Pettigrew came out holding out Voldemort in his arm. Then Voldemort said

Voldemort: "Kill the spares."

You and cedric then got hit by avada kedavra.. But you survived, you still got knocked out.. Then after a while you gained your consciousness.. It was blurry but you could see harry and Voldemort holding out their wands at each other. Harry then got distracted by you alive but Voldemort didn't notice. Voldemort took the opportunity to yell out

Voldemort: "AVADA KEDAVRA!"

you then get up and push harry Potter out the way and quickly pull out your wand saying

"EXPELLIARMUS!"

then you and Voldemorts magic collide.. Forming a Priori Incantatem?!