Many MMA fighters' knowledge of standing grappling, especially at the amateur level, includes little more than the double, single, high crotch, outside trip, snap down, and MAYBE the ankle pick and head and arm throw, and that's being generous. Many are not educated in Judo techniques, or even wrestling legal throws like O Goshi or Osoto Gari. I'm sometimes surprised that this lack of knowledge doesn't lead more severe injuries because the fighter fails to break fall, forces a throw to become uncontrolled without countering it, or is intentionally dumped on his head by a superior grappler. I've been to a lot of amateur MMA shows and watched a good deal of UFC. While I imagine that people who make it to the UFC have been through the fire and can adapt to almost anything, even at the amateur level I haven't seen much in the way of face plants and knee rends. What do you think protects competitors?