Hello guys, I remember only one scene about this movie hopefully you can help me with that.

A girl has a pretty long hair and when she removes a hairclip from her hair, it drops down and we see that there is a weapon(most likely a ninja star but cant be sure of it) tied to the tip of the hair and she swings her head to kill her opponents. It was a very impressive fight scene.

She's likely to be Asian and I guess she was the sidekick of the main antagonist.

Thanks in advance. Have a nice da :)