You could NOT allow any slack into the lazy sheet or the sail would flog, turning the wire sheet into an all devouring metal snake, tearing up boat & crew.
known as a "casualty cast-off"
one of my casualty cast-off's flicked the new trimmer right out of the boat. Certainly changed the mood on the boat when we replaced wire with that new fangled spectra ropey stuff.
Great post Longy.