Check @Tidgney here in the same situation as the other driver on your video is passing the first left apex 3kmh faster , going through thie fast chicane comfortable. I think that in your situation , in a better position , you could pass braking later with more speed ahead of him. Anyway , you had the choice also to adopt a defensive driving line. I think he was as surprised as you to be in this situation . Racing incident , IMO.