The briefing is firstly to try to get the winch load into the aircraft.
If not, wait till they land on the ground as the helo descends, then cut the cable, so they don't roll down the hill with the chopper.
But look up the statistics of how many actual engine failures happen with a hoist load, compared to the myriad of other ways that it can go wrong, twin or not. Rotor strike, poke the tail into a tree, runaway hoist, cable snags on something, inadvertent cable cut, rescuee wriggles out of horse collar, stokes litter spins without a static line.
RVDT, the winch can also be used for training, not just for a real emergency.