Antifa did block the street and slowed or stopped at least two cars before the Challenger plowed into the cars.
https://www.youtube.com/watch?v=r0guSatguSk
I hope the driver gets a real good lawyer. I also suspect that sorting that out in the courts will get ugly.
What is a driver supposed to do when surrounded by a mob in the street, threatening direct violence? That question has never been answered. It was first asked during the BLM protests a few years ago. I can't see that anyone has the right to block traffic in the street, yet it was allowed back then.