I saw enough in the video by way of provocation that there would have been teeth, hair, and eyeballs all over that roadway! I had a similar incident to this one back in the early 80's. I was minding my own business driving the speed limit when I found myself surrounded by a crew of about 10 maggots on big Harley hog type bikes. They came off a 2-lane secondary road onto the 2-lane primary road I was on and quickly caught up to me. They decided they would pass me, and put on a little show...like speeding up, and then slowing down between 30 and 40 MPH while swigging and spitting their Buds at each other. This went on for about 5+ or so miles during which they would speed up where it was safe to pass to the rate of speed I would speed up to pass them and then slow down again to their slow speed on hills or other no passing zones. This went on for about the next 10 miles or so. This went on forever at speeds up to and over 100 MPH! Finally, the leader, who was staying right with me as I'm trying to pass, looked over while I was looking at him and shaking my head "NO" and he decided to break it off. The look on my face alone probably gave him pause, and I doubt he really understood how close he came.
What they couldn't know was they were testing my internal PTSD off-switches. To this day, given excess stress, especially of an intimidation kind or direct overt provocation I become very unhinged, start to experience tunnel vision, and for all other purposes out of control, with respect to knowing right from wrong. Worse, I've in the past didn't care enough to fight the urge to do again what I was so well trained to do back in the day. As luck would have it, this issue has only come up about three times since the 60's with no bad outcome. I honestly don't think, given what I see on the video, a bad outcome would be avoidable. I'm so glad I wasn't there!