Alice paused, unsure what to do next, as the deep thwack of a helicopter grew to buffet the crowd. She’d not seen a mechanical aircraft in years, and she squinted as a downdraft blew dust and dirt into her face. The large vehicle settled on a landing pad glued to an upper level platform. The machine looked old and repurposed, encrusted with weapons and comms gear. The Bridge rattled beneath it. The rotor’s vibration shook her feet, then the noise cut off.