Possibly he shouldnt have cranked the bike up to what was obviously a ridiculous speed while passing on a double yellow line. A driver could just as easily have dodged left to avoid a pedestrian or other obstacle and the outcome would have been the same. A rider passing at a reasonable speed on a proper section of road would have been able to safely brake in that situation.
I didn't see speed as a problem, more of a distracted rider and pissed off motorist.
Judging speed on a 2d screen by eye is just about impossible, not saying you might not get a lucky guess... Car could have been real slow.