..."Come to rest"....
If the chopper is sat on the ground but parts are still moving - has it really come to rest?
Kind of depends on your definition of at rest doesn't it?
Could mean once you're on the ground, or once everything has stopped moving. I agree that if theres parts moving - it could hurt someone so someone has to be responsible - and therefore PIC.
Otherwise we'd all just kill the power and swagger away into the sunset, lighting a cigarette, blades spinning away in the background...