wielding homicidal maniac he corners the boys in Neils room and  as he begins hacking his way in a la "The Shining". When the camera  switches angles you can plainly see that the panel hes chopping his  way through is different than the other ones, its made of a thin  balsa wood that easily breaks apart when he hits it. It also  explains why he continues to focus his chopping on that one panel  even when theres not much left of it.