You can’t effectively finish the fight with the attacker on your back. And it’s certainly going to be more difficult to get away with an attacker hanging on you. Krav Maga Worldwide students are taught to recognize when sufficient space has been created, and make their move to “turn into” the fight, where they have full use of all their strikes. You can turn either direction once the space is there, but whichever direction you turn, you want to turn in behind your elbow. So, if you are rotating to your left, you will raise your left arm in front of your face so that your nose, mouth, and eyes have something slightly blocking them in case the attacker tries to hit you.