I tend to agree that it was the air boss's fault. I've been attending one of these for 20 plus years and have never seen the fighters at the same time as the bombers unless they were doing something very specific like and escort for photographs, they are always at the same relative speed also. I attend the Reading WWII weekend in Pennsylvania, and they have several CAF aircraft at every show. B-29's, B-24's, B-17's and the smaller two engine bombers. The four engine bombers generally simply circle around at relatively low altitudes and do photo passes just as this one apparently was doing. The other classes of planes typically do the same thing with a few exceptions with one or two of the fighter planes which perform stunts of various sorts, generally rolls, climbs, etc. But while this is happening, all the other planes are well clear of the airfield. It is kind of boring watching the slow passes but then these aircraft are 75 plus years old and few and far between so it's understandable not to put them at risk.