That is going to be an interesting report. Was there any convective weather or severe mountain waves/CAT around? The Hawker is a pretty strong plane, and its is also fairly benign handling, and has the stick pusher/ident system. aerodynamically, the plane doesn't have particularly untidy manners. At 20,000' they have buckets of excess trust, even with one only going. Curious.
The video posted above suggests that the Hawker's handling in a stall condition is anything but benign.