“I don’t know how to shoot,” I remind Amy as she roots around in the armory.“It’s easy,” she says. She thrusts a heavy metal gun into my hands. “I’ve already loaded it. Point this end at whatever’s out there and pull the trigger. Bang. That’s all there is to it.”She drops two small, green, egg-shaped objects in my hand. “Impact grenades,” she says at my curious look. “If the gun doesn’t work, just throw these. They’ll explode once they hit something.”