Maybe your tail rotor had lost some effectiveness throughout the final stages of your approach since it was blowing its washing directly into a 10-20 knot wind. The wind dropped and you lost the loss of effectiveness
, becoming more effective.
Other ideas
- was there any unusual configuration ie floats, doors off?
- hydraulics on the tail rotor acting up?
- Yaw SAS acting up (don't know if this is even a B206 option)?
- maybe it was typical LTE and you turned 270 degrees right
