Aroa:
I trust you have made detailed written notes of the events. As the lead post you are very definitely going to be interviewed by Police and ATSB and you will get your day in Court with the Coroner, there is no escaping that!
Having been a lead witness in a previous fatal; trust me it's not a pleasant experience. Facts only and don't use words like 'maybe', 'approximately', 'possibly', or 'I think' etc etc as this will lead to protracted examination and cross examining, all adding up to stress..
You appear to be a "key" witness.
Fly safe!