Cornish, the incident I was involved in was flown by a QHI during my basic rotary training course, who was just a little too exuberant when flying a low level join at our relief landing ground at Chetwynd. The slight complication in our case was when the aircraft snap rolled upright we were looking almost straight at (and below the cables of) a set of HT pylons that had previously been just off to our left; we were in a steep right turn to avoid them. The QHI made a debrief point of the incident. Later in the course one exercise was to be given a demo of RBS at 10,000 feet. It wasn't anywhere near as effective as my earlier demo!