Misconceptions galore
While Colonel Graham is a distinguished Blackbird pilot and well experienced fighter pilot, his ability to teach aerobatics in such a trial and error method is far removed from what might be taught by a typical qualified aerobatic instructor. especially one with a competition background.
In no way does time at Mach 3+ equate to instructor value doing immelmanns.
I say this from my personal standpoint of considerable aerobatic/airshow experience, in addition to also having Blackbird time in my pilot's logbook.
Much of the time spent on the roll out at the top of the half loop includes errors and misconceptions, in addition to the comment made by another commenter regarding the need to immediately push to -1G prior to the roll; also wrong and dangerous.
Every year, lives are lost in botched aerobatic maneuvers. I would highly stress it is not a self-taught activity and urge anyone with the hopes of enjoying this multi dimensional regime to get professional instruction and guidance. I shudder to think of the RV guys out trying immelmanns after viewing this video.
George Andr?, USAF, Lockheed, TWA, Freebird Airshows, Team Zipper Air Racing, and other nefarious classified endeavors...