As the FULL video shows - which ofcourse the media refuses to share -, the "peaceful" protesters attacked the car with weapons before the car driver possibly panicked and ran into the crowd. Further in the video you could also see the protesters (illegal protesting, only the "racist nazis" had a permit to protest, not the antifa and BLM scum) blocking the cars and it all escalated into bad karma for the "peaceful" protesters.
(Wanted to post this days earlier, but I'm new to this site and had to wait for my registration to be accepted :()