Here i am on my way to do my P's test on a straight road with an 80km limit. I Was sitting in the left lane for the whole time whilst on this road when all of a sudden i hear the loudest screeching carrying on for about 5 seconds. When i work out that it is coming from behind me i look back and see a car on the dirt hill on my left hand side sliding totally sideways. It all went into slow motion and i could see the white of the passengers eyes and her face i thought the car was going to roll as it was still carrying speed and going completly side ways. I dived down a side street and came back around they had come down from the hill and the car was on the side of the road. The skid marks start in the right hand lane and continue for about 150 meters across the left lane and up the dirt slope then continue side ways for about another 50. I pulled over to make sure that they were fine by this time the male had the bonnet up and the engine was a hoons dream. I said are you guys alright what happened. She said that they were going to change lanes and a motorbike had changed lanes in front of them and cut them off but there were no bikes around when it happened apart from me. I was in the left hand lane the whole time and their skidmarks start in the right hand lane and go for at least 150 on the road and 50 on the dirt so i would gather from that he either needs new tires or he was going a lot faster then 80km. Enough to shake me up as i looked behind me they would have been only 10 metres behind me. Little bit faster for him or little slower for me and there goes me and bike. I think they were just looking for someone to blame for the incident i think the b/f prob made a driving mistake at speed and tried to turn the blame elsewhere. As i didn't consider myself at any fault i just rode off after i saw they were both out of the car and fine. I didn't give details or name or anything like that as to me i had nothing to do with the incident. Was i correct in doing so?