mygrandjourney: at first glance, I'm not sure if habit reversal training sounds like a good fit, as this was a one-off rather than a habit. Have you seen it successfully used in such cases?

I have seen it work effectively, but it requires commitment and consistency. Mindfulness, stress reduction/relaxation, tai chi, yoga are all well researched tools. Therapy is generally about slowing down and understanding your own anger process and factors that might have contributed to your actions. Don't reject them until you try them.