Isaac's Binding: Beginnings (TBOI)

Isaac cries.
He's cowering in the basement with his blood-thirsty mother looking down on him from the hatch in the ceiling. He looks around. His dead cat, Guppy stares at him from the unknown darkness, crossed out eyes not seeing.
Isaac decides crying isn't doing him any good, and he crawls to the nearby door from which horrifying sounds emit. He steps through the doorway and is greeted by the unseeing, bloodstained eye sockets of a long lost person, naked and angry. It attacks, and in his desperation, Isaac flings his tears, his only weapons towards the unholy being.