Recall some years ago, minding my own business, wending my way back on a bike via a small country track shortcut back across the Somerset levels after a few(!!!!) beers with friends in the next village on a pitch-black night, the peace suddenly being shattered as the sound of helicopters at low-level rapidly grew in volume.
Some 6 SK 4's, line astern, swept right over me at tree-top height, rotor downwash clearly felt (the trees were not very high - more large bushes!), with only #6 visible with lights. Quite near sent me straight into the adjacent rhyne they did!
But a most impressive "sound/sight" and, thankfully, I avoided a dunking! To this day, I still wonder if they used the feeble, flickering light I had on my bike as a "target" to see what chaos they could cause? If so, their plan very nearly worked a treat!!!
H 'n' H