Heliport
I personally don't think the 'display' itself was dangerous except for the fact that there was other traffic departing and arriving at the same time and as I said what if some non-radio machine had arrived at the same time?
With all these things it is best to wait for all the real facts to come out rather than all the perceived facts known by people who knew people who knew people that might have been there and perhaps witnessed the event.......!!