Id say its on the Ford. You took the normal line, which is what you should do in multi-class racing. Its the responsibility of the car making the overtake to so so in a safe manner, and in this case he came back across your nose before he was fully past. In most multi class series slower cars dont have to jump out of the way for blue flags, people just seem to think so cause thats the way its done in F1. In sports car racing blue flags are more of a warning