Retro Trailer: Naked Weapon (2002) by Ching Siu-tung

Details the workings of a mysterious assassination organization, (codenamed: Naked Weapon), led by its globally feared and master assassin, Fiona Birch. It essays the modus operandi of Fiona where she assassinates a crime mob boss and his mooks. A trained assassin, she violently breaks the spine of a fat mob boss using the infamous Deadly Spine Rip technique.