Don't panic, I believe tha rider was OK.
Someone I know saw it and said he was filtering to the head of a light controlled on-ramp Coquitlam to Hwy 1, when someone opened their door and knocked him off. They described it as looking like a pinball machine the way this kid (on a sportbike) bounced of doors and cars.
It appeared to be deliberate!
That's one of the hazards of filtering, but I'm still very much in favour of legalizing it.