地铁短喜剧：逃跑的雨伞

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Create a 15-second live-action visual comedy on a quiet subway concourse. Two adult commuters wear distinct outfits: one in a green raincoat, the other in a navy suit. Seconds 0–4: a wide static shot establishes their positions as the raincoat wearer shakes a closed umbrella. Seconds 4–9: the umbrella unexpectedly opens and rolls slowly across the floor; track it at ankle height while both commuters cautiously chase it. Seconds 9–15: the umbrella stops beside a lost-property desk, and the commuters exchange a relieved smile. Preserve their faces and clothing across cuts. Natural station ambience and a small umbrella click; no dialogue, collisions, readable signs or added crowd.