It was crawling traffic into the town centre. I was behind a mini Countryman when an articulated lorry wanted to change lane before aroundabout The lorry driver indicated, but obviously didn't see the mini as it was just along his cab, too far ahead to act on his signalling. As a result, the lorry nudged the mini to such an extent that the left side wheels were both lifted. The mini then pulled over. As she was walking towards the lorry, I wanted to tell her that I had dashcam, but then cars behind began sounding their horn, so I had no opportunity to convey this message. As it looked like it was 100% the fault of the lorry, I wanted to assist since I have the whole incident on mp4, 1 minute, 100MB. But what can I do now?