"He attacked me, I grabbed him, he fell down while I was struggling with him and broke his arm. It all happened so fast, I was just trying to keep myself safe."
That is my prepared speech for anyone who asks me to explain myself after a fight.
If that's what happened, that's great. If it isn't, I dont lie well, certainly not in a court of law. Yes, I have the backup of a canned response based on training and experience. However, I dont want to have to use it beyond the occasional incident report.