Quite. You blew away a fence because your TR was producing thrust - the OP was about turbulence from a MR at flat pitch
A plank driver asked, wether it is possible to have turbulence due to nearby helicopters.
Not understanding all the factors - he assumes, it must have been downwash.
I just added another possibility - which might not spring into mind helicopter pilots operating smaler helicopters - but heavy "birds" ;-) ahh helicopters need a lot of anti torque - which is produced by the tail rotor.
Even a slight foot forward, which won´t move or turn the helicopter will produce quite a lot of wind from the big fan at the back.
Understandable now?