A quiet town before dusk

Create a fifteen-second fictional period-film opening in a modest riverside town during the late 1980s. Two adult friends walk through a sunlit square holding ice creams, with ordinary bicycles and apartment blocks behind them. Begin with a relaxed lateral tracking shot and fragments of indistinct conversation. At six seconds, cut to a close view of one ice cream beginning to melt as a distant industrial hum gradually enters the soundscape. Return wide: the friends continue talking, unaware that a line of birds has suddenly left the rooftops. End before any explanation. Keep costumes and street props period-consistent, use restrained film grain, and avoid showing a real disaster or presenting the scene as historical footage.