You were a medium. At the moment, you were watching 8 year old David Glatzl get exorcised.

All of a sudden, David gets up, hitting Ed's chest.

"I'll stop your heart, old man!"

He exclaims as he hits Ed's chest, stopping his heart.

Then Arnie gets David and yells

"Take me!"

The demon possesses him, leaving David alone to run to his mother and father, leaving Ed on the floor shaking.