Doug seems to believe that, should they travel to the source of the infection, there's a good chance he'd be able to develop a cure to the virus, so it's at least somewhat hopeful.
And the Adventure Continues: The film ends with the outbreak still in full swing, and the group headed off to somewhere "where kids won't go".Almighty Janitor: Hitachi can kick some serious ass, and seems to enjoy it to boot.Zig-zagged, in the sense that he only seems to know weapon-based Martial Arts. Air-Vent Passageway: Played realistically - they're small enough that Clint and Lucy are the only ones who can fit through them.That would be any parent's worst nightmare. Adult Fear: The idea of children killing (let alone eating) innocent people.She volunteers to follow Clint through the air vents, and during the big fight against the zombies in the schoolyard, she's the only one without a weapon.