I cant blame anyone for speculating. We need to see the whole video to be sure of the exact situation. We dont know because it is being hidden from us. That black car *is* in a strange position. 
I think the (driver of the) black car started an overtake at the same time as the motorcyclist was trying the same thing. The motorcyclist had no time to react due to excessive speed. The rest we can work out ourselves.

I think the (driver of the) black car started an overtake at the same time as the motorcyclist was trying the same thing. The motorcyclist had no time to react due to excessive speed. The rest we can work out ourselves.