The house seems to change at random between a state of dilapidation and a state of domestication. Threatened by the zombie-like creatures, Nikolai shoots one of them in the leg, only to find that the wound appears on his own body. He deduces that they are his and Marie's doppelgängers, and that 'what happens to them happens to us'. When Nikolai falls into a hole in the floor while the house is dilapidated, Marie is unable to rescue him as the hole suddenly is sealed when the house changes to a domesticated state.