The service letter amplifies what is already known about Fenestron stall - you need to apply maximum right pedal immediately - it also says it occurs in light winds.
That Taiwanese 365 had a major loss of TR thrust, not LTE or Fenestron Stall - it kept spinning, which doesn't happen with FS - as bobakat says.
As an ex- Gazelle pilot/instructor and a current 365 one, I can say that there is at least as twice as much TR authority in a 365 as there was in the Gazelle and a 40kt cross and downwind limit.
In a strong downwind condition - >20kts - the large tail fin does make directional control a little more twitchy but any tendency to weathercock will be negated as the aircraft comes back round into wind.
Would a pilot have a different response in the first few seconds had their not been a person on the line?
almost certainly - he did a great job getting the person on the wire safe - just unfortunate to crash afterwards.