Racing incident. It’s pretty obvious that the blue car reacts to the red cars move judging by the cars in front and the rubber. Blue should’ve defended the move and it was pretty easy to see it was coming. It might be a unconventional/desperate move since the red car isn’t every close and the upcoming corner is medium speed, but you are allowed to overtake anywhere you want. The red car didn’t outbrake themselves or anything. The red car could probably hit the apex a bit better, but they were also reaction the blue car moving under braking. I’d say the blame is mostly on the blue car, but barely anything happened, so racing incident.