Luna the deadly cyborg

Plot: A guy comes to the gym to show off his fighting skills, while he is practicing he notices a beautiful (Luna) woman training and starts talking to her, but she makes it clear that she is not interested which makes him angry, so he starts too make fun of her and challenges her to a fight saying she won’t last 10 seconds, unknown to the hotshot she is a deadly cyborg who proceeds to slowly beat him up and kill him.