You are writing a BSc level Uni assignment on areodynanics?
All things mentioned are backed up here.
Stall (flight) - Wikipedia, the free encyclopedia
To all intent and purposes, the aircraft was entering a spin when it impacted the ground. All due to a pilot disregarding and exceeding the handling limits of his aircraft.
All his other antics were released on an flight safety video.
YouTube - Mishap of B-52 at Fairchild Air Force Base Washington