"LTE" is a pilot problem  

"Shortly after take-off from a helipad and while in a low hovering left turn, the helicopter yawed uncommanded to the right.

In response, the pilot lowered the collective to reduce height, then closed the throttle."

Wait...what? The narrative says that the pilot was in a hovering left turn and then it yawed to the right??  Hmm, nowhere does it say that the "pilot" applied full left pedal and held it, which would be the correct control input for an uncommanded YAW. There seems to be this persistent misconception that the t/r of a 206 "stalls" or "cavitates" or otherwise stops producing thrust. Nonsense!  The tail rotor never stops working! You just have to not be a wuss. You have to quickly stick in some left pedal...FULL left pedal if need be, and hold it there to stop the dang rotation. If the rotation does not stop (t/r failure?), then yes, reduce torque. Bottom Line: Don't let a right yaw rate build up in the first place - STOP IT NOW!

I've linked a long article on LTE. It's a complex issue. If you read nothing else in it, go to Page 9 and read paragraph 4.4. "LTE" is a pilot problem.

https://dspace-erf.nlr.nl/server/api/core/bitstreams/361d1a83-d60d-4f8a-8599-23c0dfd7249e/content