here is the link to the crash, it wasn't directly associated with the filming itself, just the director was having a pleasure flight in Kenya.
It wasn't a pleasure flight, he intended to film.
The foxbat was not the subject of the documentary.
He was a young producer/director/cameraman who did not have the benefit of anyone in the field to oversee his decision.
Weather was violent. Numerous helicopters with commercial pilots were based at the field.
They were attempting to shoot air to ground of old airplane wrecks.
Two lives squandered by poor management influenced by the glamour of filmmaking.
Such pressures are a significant factor in making aerial filming and photography the most hazardous of all assignments (outside of war zones) for cameramen.
I am not surprised that the most "dangerous flight" was not a ferry flight but one planned and chartered by a film crew.
Don't let it happen to you, the adage "the show must go on" has no currency in aerial filming.
Mickjoebill