How do you stop a bleeding fist?

The best way to stop any external bleeding is direct pressure. Get a clean towel and fold it so it's compact, then press it firmly against the wound. Hold the hand above the level of the subject's heart. Don't flex the hand. Bleeding should stop in about 10 minutes. If you can't get it to stop in 20 minutes, you should consider calling for help. But this is very rare.