Create an original high-concept action thriller sequence, 15 seconds, 16:9. A lone agent stands inside a glass elevator descending through a skyscraper at night. 0–4s: city lights streak past the glass walls. 4–7s: an explosion destroys several floors below and the elevator suddenly loses its cables. 7–10s: the elevator plummets rapidly while the agent braces against the walls. 10–12s: emergency brakes activate just meters above the ground. 12–15s: the doors open and the agent calmly walks into a chaotic lobby filled with smoke and falling glass. Realistic glass physics, dramatic reflections, practical-action aesthetic, cinematic slow motion, photorealistic.