Yeah,the accelerated stall was a consequence of their late inputs to correct the manoeuvre: the B-52 is a big bird with a lot of inertial response(throttle lag,sluggish control),which comes more evident at slower speeds. He was probably trying to do a "sling turn",where he would gain momentum from the turn dive,but he was too low/slow, and correcting that on a B-52 was impossible.. the crew probably had the time to realise what's goi g on and tell him "you killed us,r u happy now, asshole?!"..