if you noticed where the drone footage was from, it was above Ft Dennison. right in the middle of fireworks restricted zone, i am pretty certain, that CASA would have only allowed it to fly there, after filing a flight plan, and risk assessment forms, probably done after the last NYE show.. so, even if it was hit by a firework, it would have crashed into the harbour a safe distance from everyone.. even those flying over the fireworks on a harbour scenic 2 would be in no danger, min 2100ft and all.