meh None of us have all the facts, so I can't get too upset with any theories that conflict with mine.
And this is an Intertubes forum, not a court of law.
Regardless of what the law is (and assuming my theory is correct), I think the guy in the RR was justified to react the way he did in that situation. His only option was to get away from the guys. The riders had blocked a major road so that his only path was over those bikes and people. The riders intentionally put themselves in danger. YMMV