Actually your post says nothing of the sort. You think they just decided on the day hey lets operate from this pad that we have never done so from before ??. They operate from the ticket booth pad every day - its NOTHING NEW.
Well if thats the case then this was an accident that was always going to happen. To have one helicopter depart at 90 degress to an arriving helicopter's flight path is just negligent or did they normally only operate from the so called ticket booth pad everyday? My interpretation of the video is that the arriving pilot was not expecting there to be any traffic coming from the "ticket booth pad". If it was in daily use then you would think he would be scanning in that direction as he is making his approach.
Better contact ATSB and tell them to stop their investigation as you seem to have worked out what caused it.
Do tell your version of events then.
There was 180 degrees of azimuth available over water for the arriving and departing helicopters to be separated.
Yet they were in exactly the same airspace.
I wonder if that's what the local procedures called for.
If so it was a potential accident waiting to happen.
For some though Dick it was just another day at Sea World where the only problem was the operating crew and their inability to give way at a helicopter T-intersection.