Not everyone can be a competitive fighter, but everyone can learn to visit violence on a predator.

https://soundcloud.com/artofmanliness/334-when-violence-really-is-the-answer

This is an interesting discussion about violence by Tim Larkin who founded Target Focus Training. I follow Injury Dynamics by Chris Ranck-Buhr but Chris and Tim were partners in TFT for about 17 years, so this discussion will sound familiar.