I didn't intend the race. I am neutral
In my opinion, the attacker is guilty (Situation B). At exactly 00:13, the red car is approaching the curve at the right place and begins to turn in, exactly on the racing line . Due to his position at that time, (front wheel not exactly at the same level as the red car back wheel) the yellow car should have anticipated that overtaking could not be successful. Plus the yellow car was at that time pretty far from the red car, and it was not easy for him to see the yellow car in mirrors.
The contact occurs at 00:14, pretty far from the appex of the curve.
To avoid the situation, the red car should have maybe turn in a little sooner, or drive more on the middle of the track when he was clearly in front of the yellow car (00:12)
My two cents (not an expert) , the yellow car is faulty.
I mean, I would have probably driven exactly like the red car, and would have been surprised exactly like I suppose it has been surprised .
but it is a race event, nothing else. All happens within 2seconds after all. (between 00:12 and 00:14)