WOW that is stupid scary! Don't mess with cars as there are some really stupid folks out there. No concern about the fact that a bump from a car would be the end of the biker's life and the R8 driver would be OK - well as OK as they have ever been.
only watched about a minute, but from what i could tell the idiot in the car was losing a race that nobody else knew about. Its legal to ride like that in many south american countries (forgive me if I'm wrong on that). they honestly weren't going belligerently fast like the idiot in the car.
personally, if i was on one of the bikes, i would have pegged it and left the idiot in the Audi trying to kill me.