Actually, I have some different footage of me passing another cyclist too closely some years ago. I didn't realise at the time, but some criticism on that one made me change the way I pass people.
@Jakob, there's no dogma, only common sense. If you're not looking, then you don't know what's going on. If it had been you or me in the cyclist gets a fright video, we'd be mortified at not having looked behind and being unintentionally surprised like that. The dogma (and nonsense) comes when people insist how important hearing is when cycling.