If the cyclist had dabbed his brakes around the 13 second mark instead of speeding up, the whole incident would never had happened. Sometimes, it's not just about driving according to your rights, it's also about being considerate to other traffic.
If the car driver had been treating the cyclist as another vehicle on the road rather than a 2nd class user to bully out of the way then he never would have even attempted that.
would he have done that if it was a car? bus? van? milk float? no, he only did it because it was a cyclist and that's the whole point of incidents like this, highlighting that cyclists have to ride like that because some motorists behave like that.
And they behaviour of the driver with the horn and running the cyclist off the road afterwards is totally inexcusable.
I've banged on someones car like that when they pulled a similar manoeuvre on me once, he also got shirty at me for 'touching' his car but when I pointed out that had I not had my wits about me and managed to swerve it would have been my nice hard, pointy bar end making contact with his car instead of my relatively soft hand he kind of got the point.