I learn something on this site every day!
Normally with these accident videos, although there may be some debate over the detail, you can normally get a general sense of what the pilot was trying to do and what went wrong. More importantly, (with the benefits of hindsight and infinite time), you can discuss what the pilot should have done to avoid\mitigate the accident, and hence at least learn something without having to make the mistake yourself.
In this case, however, I just can't work out what the pilot was trying to do or why. Was he drunk\drugged; showing off; had no experience on type (or even rotary)?
The flight path looks pretty similar to my first attempts to fly a jetranger in Microsoft Flight Simulator, which was at a time when I'd not been near a real helicopter and I was trying to use a computer keyboard to control the craft!
Matthew