Sci-Fi Interstellar Courier Transformation Scene for Seedance 2.0

**Visual Tone**: Sci-fi cinematic feel, realism, film grain texture
> Close-up, continuously tracking downward on the forearm. The cuff of a man's [@Image 1] worn leather jacket suddenly splits open, and a hidden metal mechanical plate underneath violently springs outward and unfolds. Heavy titanium alloy pistons extend, interlocking with precise gear sets with a crisp "clack" sound. Thick, industrial-style metal armor segments quickly cover and spread up the arm to the shoulder and chest. The entire process is filled with a sense of heavy machinery and industrial power. Side cold cyan ambient light, sharp contour hard light. The camera tracks smoothly upward from the forearm along a linear rail. Sound effects: Hissing of piston exhaust, continuous crisp metal "clack-clack" of gears meshing, heavy "thud" of armor plates locking. 
> Close-up transitions to medium shot, the camera continues moving downward (same long take). In the armored palm, precise metal mechanical parts fold and unfold layer by layer, reassembling and transforming into a heavy, industrial-style sword hilt. The top of the hilt suddenly ignites, and a core of scorching blue light illuminates. Subsequently, translucent holographic laser crystals rapidly extend forward from the core in segmented forms—each segment briefly hovers in the air before quickly locking together—finally combining with a "hum" into a complete, extremely slender holographic laser katana. The blade emits a deep blue glow and faint digital particles. 45-degree top hard light, deep shadows. The camera slowly pulls back to show the entire sword. The character transforms into the final heavy mech form [@Image 2]. 
Sound effects: Friction and reassembly sounds of metal parts, crackling of electric arcs as the laser ignites, followed by a deep, powerful low-frequency "hum."