In a previous scene, Smoke watched his twin brother, Stack, get killed/drained of his life… Now, Stack is seemingly alive again, behind a door — up and talking, demanding to be let out.

There’s real, emotional motivation for Smoke to let his newly alive brother out, but something’s not quite right with him. Annie even says, “That ain’t your brother.”

We don’t know what will happen if Smoke opens the door. We imagine it could be something horrible — and that’s what creates the suspense.