One of the things I always do, no matter what I'm teaching to people, is underscore the brutal reality of any sort of violence. The essence is that any sort of violence is scary, dirty, nasty, ugly, and not really a whole lot of fun once blood gets spilled.
THEN, I tell them that you cannot dwell on this reality, or else you begin to shut down a little, and can't focus on the task at hand. It's only something to be cognizant of, not brood over. Always remember that we are training for a bad situation, in which guts may end up on the ground, but don't dwell. Some eyes got real big when I told this to a women's class, but in the end they were very appreciative.
I saw this in a Kuntaw class at college. The college instructor, who was not one of my favorites, was very focused on flow, and feel, and blah blah blah. It was apparent he had not been in a fight. As stated, it's not good to go overboard with flow and all that. It's important, I think, but not THAT important.
Kent