Se7en (1995)

Two men in a dimly lit, smoky hallway, one in a dark suit and the other in a trench coat, walk forward before the scene cuts to a man in a dark uniform holding a shotgun, aiming it forward as he moves through the haze. The sequence continues with the man in the uniform advancing, the shotgun raised, as another figure with a flashlight appears behind him, illuminating the smoke-filled corridor.