if you look at the top sections on the two (shorter) tenor drones they slide up and down, you can adjust the drone reeds strength and pitch by moving a bridle up and down the reed body, normally, when setting up a set of pipes you have the sliders set the same and adjust the reeds so the pipes tune in to the low A of the chanter, the outer tenor drone is in roughly the right place but the middle is very low, suggesting the bridle needs to side down shortning the reed and making it sharper so the piper can lengthen the drone to bring it in tune, however adjusting the bridle also affects the strength of the reed so most likely the middle drone will be drawing much more air than the outer it will strike in earlier and carry on honking for longer when the piper finishes his tune, and because the reed will be drawing more air it will make the pipes harder to play, as the bag will be emptying faster, its possible hes performed some kind of emergancy fix on his drone reeds and hes back off the bridle becasue the reed is shutting off, in a solo pipeing competition a judge would immediatly pick up on the fact that the pipes are incorrectly set up. Im not criticising the lad its just that incorrectly set up pipes are a pain to play .