I think he ran into the preexisting accident between the BMW and that third vehicle. He probably hooked bumpers with the beamer.
What car hit him?
https://www.allenbwest.com/2017/08/14/new-shock-theory-emerges-charlottesville-drivers-motive-blowing-minds/
http://www.cnn.com/videos/us/2017/08/14/charlottesville-police-chief-presser-regret-sot.cnn/video/playlists/charlottesville-white-nationalist-rally/
Who was driving the van?
http://www.dailymail.co.uk/news/article-4789682/Drone-footage-shows-man-crashing-car-alt-right-rally.html