While a grappler is positioning himself a true karate ka ( not a Mc black belt) will be bitting, eye gouge, groin, and small joints. Now before all you say these dont work consider that a true Karete ka is fighting for self presurvation. A bite = a chunk of bloody meat being ripped out of a leg or neck. groin= pulled , smashed, twisted, poped, shreaded. eyes= digging in and poping the eye out. these techniques are done instantly if the fight goes to the ground but I do believe that you fight how you train and if trained right Karate is a great self defense Art. I remember the first day in BJJ class, I was being owned by a blue belt, until I put on a wrist lock, I founf out they werent allowed but it worked and I was also very aware of all the targets available to me. So it the trainning. I am trained so that if I am being taken down and cound not avoid it, my fingers wrap around the head and the thumbs are going in the eyes.