You see a vapor trail and, when flying at high angle of attack, vortices only if the air is not too dry. There are thin clouds at greater altitude, but at the altitude the plane was flying the air might have been pretty dry.No vapor trail or vortices over the wings this time around (neither in the photos nor the video). I doubt that the pilot was pulling high g's and I thought that the plane was flying at pretty low speeds the whole time. From what I've read the pilot purposefully flew over the "hill" where the wall climbers were watching so they could get a better view and this really shows! The guy was at the perfect place this time around.