An interesting discussion, duude, 10K on the 206!! Can someone live that long! Makes my paltry 1400 hrs like a mere whiff in the nostrils! A good point made, on the fact that for T/R VRS to occur, a window must be achieved where thrust is being generated (thus causing an induced flow) and an external RAF that will EQUAL the induced flow, causing the VRS to develop, once developed it has the nasty characteristic of locking onto the rotor disc until recovery is carried out, normally by reducing power (induced flow) and increasing fwd speed to blow the whole shambles of the disc. This is just like main rotor VRS and as some have said, it can occur at small torque pedal input values and minor cross winds due to the tail rotor entering the window of opportunity.
Fortunately, I think many tail rotor systems will either pass through what is a small window and or will power through VRS conditions. In the Alo III for example, demo'ing this to students, it was not easy to demonstrate vortex ring state on the main rotor due to the narrow entry window which had to be carefully flown. If the VRS is not allowed to fully develop, the Alo III would just power out of it (the power available causing the induced flow to rapidly overcome the VRS development). But then the Alo III was/is, a powerful little beast! Once you managed to carefully match the ROD airflow, to gently applied power (induced flow), she would get into it, with a lot of unhappy vibration and some pitching and rolling. Once developed fully on the rotor disc, you could pull the CP lever out the floor, and watch aghast as the ROD actually increased.
Lower the CP and lower the nose you felt the seat press against your butt, as the rotor started to fly again, followed by an increase of morale in the cockpit!
So, it seems LTE due VRS is not common however to be aware of it with a wind from the 9 o'clock is good, the other condition of increased induced flow will cause LTE, but you should re-gain control once weathercocked into wind, but hopefully with just a red face, but worse case, causing a crash
As for the 206 climbing turning left and descending turning right, secondary effects of pedal in the hover, is it not?