the Swan River is normally bumper-to-bumper with boats at this time of day, on Australia Day.
Actually no, every year there is a clear area in the centre boats are East and West near the causeway and the narrows. The centre is ALWAYS clear for the fireworks and the air display, given all the land areas are covered with spectators, the river is the landing area in the event of an engine failure.
I agree that they were lucky to not overshoot on to the spectator craft, which is why air displays are not OVER crowds.
This
looks more like a stall spin though but will wait and hear.