Uploader's comment on YT description: "Ended when the guy took my ignition keys and threw them away."
Please describe in more detail, what you think happened. It looks like the person driving in the black car intentionally cut the cyclist up, as they drove their car into the wrong side of a junction. When that didn't work (knocking them off or assaulting them?) they raced ahead, approached the cyclist and twice assaulted them despite not being provoked. They also touched the cyclist's property (bike). Anything else anyone wants to add..be my guest.
Anyone ever touches you then that's physical assault and hence fair game to defend yourself: poke the assailant in the eyes then punch them in the throat.
Any description of the people in the van. Skin colour, age, build etc. Anything that can hopefully help people resolve this issue. PJ10 FWG, you think you're a smart-ass abusing people with their children in a car? Think again. Your reg is now on the Internet and questions are waiting to be answered. If I were your boss, it would be within my interests to find out exactly what answers you are going to come up with. Your call.
Audi driver should be done for reckless, dangerous driving. Their actions were clearly intentional.. whatever the situation, they made it 10x worse. Stop them before they kill.
Its legal in stationary traffic chief. But that traffic does not look very stationary to me... perhaps why you have uploaded a still and not a video?