I thought it was more by way of mishandling during a bodged 2 v 1 low level intercept (with Pablo and Rob as the aggressor), converting from a head-on at high speed in 67 wing, pulling hard to convert to stern attack with high alpha while simultaneously moving the wings to 45. Somebody with a better grasp of aerodynamics might be able to explain what happens in these conditions, but I vaguely reacall a warning in pilot's notes about the deleterious effects of doing this.