I want to add my analysis to this:
If you watch the video carefully of the white merc dashcam- based on lamp post calculation at the start, he is only travelling between 50-60km/h before he reach the bus stop area In the video.
The SAAB behind is overtaking other cars at most at 60-70km, not crazy fast.
If you observe further, the white merc Increased his speed (likely because he saw the SAAB snaking behind), from about 60km/h to what this post mentioned, around 85km/h. Subsequently the post's calculation is accurate- they accelerated side by side to about 100km/h before the white merc getting side swiped. The SAAB continued accelerating to about 135km/h to impact.
While the black SAABs is 100% in the wrong and in no way am I defending this shithead, it is safe to say that the white merc agitated the unnecessary speeding from the SAAB.
There is a direct cause and effect on the part of the white merc- if he did not agitate, the SAAB may not have accelerated to that speed (yes he was snaking erratically, but not at a lethal speed as seen at start of video), may not have been distracted by the tunnel vision of having to overtake the other car, and may not have crashed at a lethal speed, amongst many other whatifs.
It is however clear that if the white merc did not agitate a race, things would definitely turn out differently, lives may not need to be lost.
I really wish more commentors of this would call out the merc for his ego driving behaviour- it's like agitating a crazed person operating a dangerous weapon to use it even more dangerously. What for? While white merc may not wrong in eyes of the law, he is definitely culpable morally.