If I was there in person I'd have paid attention to the great big loud sirens behind me and pulled over. But you caught it on camera, well done. You're a modern-day Hitchcock.
I stopped the video at 18s and you can clearly see the driver has left you plenty of room.
At 35s you were practically stationary.
Just because you were startled, why cause trouble for someone who has a difficult job to do and was just going about his daily business?
I really despair at some people's mentality.
How am I causing trouble? I already said I wasn't going to report it, but in my opinion the driving was substandard.