The data is pretty depressing... the reports are abysmal to pitiful.
For a considerable time, the crew appear to have been preoccupied with tasks other than monitoring the performance of the aircraft relative to desired targets. The closest the aircraft got to an aerodynamic stall was in the middle of the inputs by the pilot which become pretty uncoordinated to the required aircraft attitude necessary to recover the aircraft from the low-speed case back to the desired speed. The aircraft was never in any particular danger, it was merely at an undesired speed, and the injuries were directly related to the excessive response by the PF.
Fatigue would add to the lack of recognition of the condition of the aircraft, and to the response being uncoordinated to the need of the situation. Presumably, this is an early morning departure ex Scotland, given the event occurred at 13:00 CDT. (16:47:30UTC, first response by crew). The crew rest before the flight may have added slightly to the actions, but 3, crew, daylight flight, after some form of local rest.... not directly a big red flag on fatigue risk management.
