SS has been held back because of the overspeed mindset, also the overspeed is accompanied with buffet and awful aerodynamic noise. The FO PFD was not recorded in the FDR. The only reasonable explanation is an amazing speed shown on FO side. FO relaxed SS at the same time with selection of CAPT 3. That`s not a coincidence...
What would you do, in the second part of this video?
https://youtu.be/MbiVuPWX5K8