 As night falls, Neil suggests that he swim to the riverbank in order to string a rope between two trees, creating a zip-line that will allow the group to cross the river.Neil succeeds in setting up the rope and Mary Ellen (Caroline Brazier) crosses first, only to freeze in fear halfway across.Allen (Geoff Morrell) becomes impatient and aggressive and attempts to get himself and his daughter Sherry (Mia Wasikowska) across with Mary Ellen still on the line.