Barty Crouch Jr. was about to die. Actually, no, it was much worse than that. He was about to have his soul sucked out of his body. He wasn't scared. Not at all. Totally not. He racked his brain for a spell that could change his fate. A spell then came to mind that the Dark Lord had invented. It was a spell that would transfer your soul and very essence into another's body.
At that moment, Albus Dumbledore walked into the Defence Against the Dark Arts office. "Severus, we will be ready with the Dementor in 5 minutes," he announced with a pointed look towards Barty, no remorse in his tone.
Severus gave a brief nod and the headmaster went on his way. During their brief converse, Barty had formulated a plan in his head. As he was not bound to the chair it would be easy to undergo his mission. Immobilise the traitor, perform the spell, obliviate Snape and sit back down. According to his master, the spell would only take place as one's soul was being sucked out so that the impression would be that the soul would be gone for good.
Suddenly, everything turned cold and a Dementor floated through the door. As it approached the pair, the Potions Master slowly backed away as to not be mistaken for the victim. As the Dementor approached the shaking form of Barty Crouch Jr., he could feel his soul slowly slipping away and he prayed with all of his might that it wouldn't go to the Dementor. 'I don't want to go' were the last words anyone heard from Barty Crouch Jr.