I want to fight people who flirt with my fiance
Why do you want to fight people who flirt with your partner?
She belongs to me not them.
You can't stand anyone else flirting with your fiance, that is quite a normal reaction. Fighting someone is going to make you look like a fool, speak to the person and tell them she is taken. If they don't listen then they are just ignorant.
Let me make a video about it and show it to the world.
Have you tried talking to her about this situation? She might think you are over reacting and it could be a real turn off. If you can't trust her to not flirt back you might need to break up and find someone you can trust.