It is always sad news when such a tragedy occurs especially when some of. those lost are known to you.
Also as always, the questions shall be asked to explain how this collision occurred and why the two pilots did not see the other aircraft in time to take evasive action to avoid the collision.
The un-official Rotorheads Accident Investigation process shall ask some relevant questions among a host of non-relevant questions and comments with the chore of focusing upon the relevant being made difficult as a result.
Recent discussion about a Sightseeing EC-130 crash discussed the "Pilot on the Left" thing in much detail and should not be an issue here except for where it bears upon the departing aircraft's Pilot being able to see to his right and his view not be blocked for some reason.
If the landing pilot was seated on the left then he should have had a clear view of the departing aircraft but apparently did not see that aircraft as it departed.
Local procedures and operating SOP's are going to be a key point in this investigation I would think.
Were the two aircraft on a common frequency and making position reports and declaring their intentions.....did the departing aircraft make a call....did the airborne aircraft make a call?
Is there a common traffic pattern used by the sight seeing aircraft so routings of all aircraft would be done so as to minimize conflicts?
One thing I noticed re the Rescue services....they seemed to be very well equipped to move the wreckage to access the victims.
This is a sad time for our friends in Oz today as they deal with this tragedy and we should consider our posts so we do not add to their hurt as we discuss this accident.
As always we should strive to learn from tragedy so they might be prevented in the future.....which requires they be analyzed to determine what happened and why so we can obtain a "Lessons Learned" and make use of them.