An interesting report.
The points made about the Griffin having been habitually flown beyond its limits w.r.t. "aerobatics prohibited" are highly relevant to other recent discussions, following the publication of a video of the wingover manoeuvre flown in an AS355 just prior to landing.
Those saying no harm can be done to a helicopter by "aerobatics" (and what constitutes an aerobatic manoeuvre) might like to read up on this one and think again.
Thankfully, no-one was hurt but the story could have been very, very different.