Well Gordy,
itīs said in the videos, he dropped it cause it couldnīt be controlled and feared a crash of the helicopter.
Still, evenso I donīt do longline, I think, could have prevented if some prehookplanning were applied.
I.e., just one extra line from the outside of the rotor to somewhere up the longline, which tilts the whole system and prevent it from turning.
Could be easily removed via slipstek just before lowering onto final installation.