Once David realizes the truth, he becomes completely consumed by Charlie, leading him to murder the local sheriff, who arrives to investigate the neighbor. Emily calls Katherine for help, tricks Charlie, and escapes into the cave where she originally met Charlie. Katherine takes the gun from the dead sheriff and finds Charlie in the cave. He pretends to be David and attacks Katherine. Katherine begs for David to fight his murderous other personality. Charlie says David no longer exists. Emily emerges, begging Charlie to let Katherine go. Her distraction allows Katherine to shoot Charlie, killing him at last.