Current battery and controller technology tends to reduce power-delivery as the reserve energy depletes,- thus the rotary-craft descends in a slow, progressive and controllable manner.
Should all batteries or all motor-feed cables simultaneously fail, or motors suddenly seize, all bets are off......but there again, should your Robinson main Rotor blade suddenly deteriorate to below specification- standard, I believe the scenario becomes somewhat similar!
[B] @ Mechta/B] If the UK runs true to form....1 followed by 2.......(because there will be so many about that their position would be totally untenable, should they attempt to slam the stable-door on a mass of stallions
)