I don't know what background Nick Bloom has but he obviously doesn't understand the dynamics of rotor disintegration on rollover. The safest place to be is inside the helio should it rollover. The rotors tend to fly away from the a/c (at great speed)and I have never heard of a crew being injured by the blades so long as they remain inside the a/c. A Puma rolled over at Abz and a rotor part travelled several hundred yards towards the fixed wing terminal!! At Odiham a Puma rolled over and the rotor tip passed right through the ground crew caravan fortunately missing everybody having a quick cup of tea.
HF