So, whilst it's not always possible by any means, especially if you have no or little training, one of the best approaches might be to ensure that no-one ever gets close enough to do this to youone of the best approaches might be to ensure that no-one ever gets close enough to do this to you. This can be achieved by simply moving back or to the side, but again, without training, and depending upon your environment and your adrenaline levels, this can also be risky, and there's nothing to say your opponent won't follow.