In the scene where the kids see him throw the body(s) down the slide, he comes right after them as he sees them. Then, a few minutes later in the movie, the kids go back to the church to look down the slide. When the guy slides down the slide, he lands on the floor, but there is nothing there. He finds the body at least 10 feet away from where it would have landed. How could the monster dude possibly had time to move the body, if he went right after them?