Very sad
I know of five such events in this country, and another who was lucky to live after being clobbered, albeit with several months of operations and rehab. He was unfortunately killed in another flying accident a few years later.
Wrestling with the Why and How is extremely difficult, especially for those that are very close.
Pre-occupation, with the mind on something else, would be the biggest enemy.
What is the old adage, 'the price of peace is eternal vigilance.'
anyone can have excellent situational awareness but it can all be thrown away in a second's distraction.
whether the close family ever understands the event or not, I think it a good idea for an experinced person to talk it through with them, quite a few times if necessary.