Pace, I have used that runway myself a few times and it is well known for unexpected wind shear and turbulence over the threshold.
Following a heavy in on that runway won't be in the equation as it is limited to light aircraft only, all the commercial boys using 20/02.
I saw mention of one of the Rig Choppers preceding his arrival but the only heli I am aware of that uses this smaller runway is the Robinson R22, I may be wrong on that score but when I have been given 26 for departure, I have often had to wait for the larger helis to vacate 20 before entering.
I know the pilot concerned and have flown as a passenger with him in his own aircraft, also a PA28 and not the one pictured. I dare say he might enlighten us in the near future but otherwise its wait and see what the AAIB come up with.