That was a "hot shot" pilot that was breaking rules on purpose practicing for an airshow. His wings stalled at around 45 degrees, then continued rotating nose down to impact.
The airplane is great, but not at aerobatics. The Vulcan, because of it's configuration, was much better at low speed airwork.
I know, but it amazed me that it was even possible (including the stuff he did that was recoverable before the fatal maneuver).