212 Man
My reading of the transcript is that the PF (PIC) was giving directions to the PM to first select Hdg mode (assume they were in Nav mode tracking DTO BLKMO) then never got around to telling the PM to turn before the Rear Aircrewman started to call urgently. This was the period when a heading change of any type might have worked. The PF did not seem to actually select or turn the heading.