Cinematic 4K action sequence along a knife-edge mountain ridge in deep winter

Cinematic 4K action sequence along a knife-edge mountain ridge in deep winter. A lean shaman in layered wolf pelts, pale frost-rime crusted in her braids, bone charms rattling at her belt, fights with a rune-carved spear anda curved skinning knife. She runs the narrow spine, plants the spear to vault a gap, drives it through a raider's chest, twists free, slashes low at a second, drops into a controlled slide down the icy slope, then rises spear-first into a third. Blown snow and ice crystals, thin blue alpine light with the sun low and hard, cornices cracking and calving away beneath every step, sweeping tracking camera, realistic physics, motion blur, savage and elemental atmosphere.