no experience myself; but i suggest you take your most co-operative and humble self to the hearing..admit that you obviously hit him, but that there was just no time for you to react and there was nothing you could have done differently..speak politely and softly ( everyone should do this all the time anyway)..DO NOT try to tell them the law by bringing up the 'non-designated area' aspect..it will definitely put them on the defensive and make them hostile..the aim is to win their empathy and kindness, make them see you as an unwitting victim too..best of luck..