This was a long week for Tim the camera man (not to be confused with Tim the tool man) that we get our airshow feed from durng the week. He gets daily assignments from the video department of things they have to shoot both for during that day and during that week. I know there were many days he was shooting footage for more that 14 hrs. Additionally it is difficult to find and or follow some of the aircraft during the night. Also, you may have noticed him focusing in on tents during the show, he does this to adjust and calibrate the camera for the changing conditions of ambiant lighting. Additionally he does have some general footage he as to capture for his assignments as well.
Hope this helps explain a little bit why he is not always following the aircraft.