Snowy Battlefield With Destroyed Mechs

the prompt

15-second cinematic action sequence inside a massive battlefield filled with destroyed giant mechs half-buried in snow and ash, red warning beacons blinking weakly through blizzards and smoke.
0.0–3.0s: Camera tracks through colossal mechanical wreckage as a lone armored pilot climbs across the rusted skull of a fallen mech carrying an energy spear.
3.0–6.0s: A rival mercenary activates from inside another wrecked titan, glowing reactor core illuminating the storm around him.
6.0–9.0s: Spear clash detonates sparks and snow outward while loose armor plates crash down around the battlefield in slow motion.
9.0–12.0s: Heavy grounded combat through gigantic mech corpses, fighters leaping between wreckage while reactor fires burn beneath the snow.
12.0–15.0s: Huge cinematic pull-back reveals endless fields of fallen titans stretching across the frozen wasteland.