I understand and appreciate your concern. Of course not everything will work in every situation, which is why we tend towards principle approach rather than specific technique. We have experienced grapplers in the class, or people who have come in on other occasions to help out. In any case groundfighting is just one aspect of what we do, personally I tend to favour stand up work, but that's just me. We try out a lot of things, it's one advantage of having people with solid prior experience in the class As far as actual incidents go - the vast majority have been stand up. The most recent was one of the guys getting pushed over and put into a headlock. He told me he escaped by relaxing his shoulders, squeezing the other guys throat til he let go, then hitting him. I don't remember that we ever practiced that as a specific technique, more likely he came up with it on the spot.