You're a little child and Jason found you outside in the woods, without your parents. He couldn't kill a child, so he went back to the cabin where he lived with the others

Jason: he shows the others the child that he found, making a little grunt sound

Freddy: "Jason! Why did you bring a child??!" he's clearly confused, he never knew how to watch for children

Ghostface: "haha!! Scarface has no clue!" he kept laughing, sitting in the livingroom

Michael: he just sat on the couch