Depends on the guy you are fighting...you can pop the guys elbow, but at the end of the day, I believe it is a much safer option going for a choke or ground and pound from the mount. An arm bar could work, but in circumstance of a street fight, it would cause more damage later, but maybe too late for you. A quick, clean finish, such as a choke or pound into submission is much more fool proof....IMO
