EDIT - this is talking to mrblackmagic, by the way

There is a 210 lbs. charging bull in my class and if he wants you to go to the ground, you're going to the ground and there really ain't much you can do to stop it. Ground combat is essential in todays age and if you dare call yourself a martial artist you should at least know basic technique. If someone knows both striking and grappling, all they need is to slide a take down in and you're boned.