If it is clearly DV and I don't know either party, damn skippy I am not getting involved. If I know either party I will, and have taken hits to protect/stop the violence. Random act of violence, say something like a gay bashing, if I think I can physically do something to cause the violence to stop, yes, if not I look the other way. Bottom line is, I am the last person that will EVER call a LEO. I would not even call a LEO even if I was the recipient of a beat down. I will never trust a LEO, and if I can't take care of it legally without a LEO, I will just deal with whatever is falling on me. And before anyone jumps on "well if you were not a criminal" bullshit, I am not, clean record (sans 3 traffic violations in 21 years of driving).