It is used as a "main courante" technique... you stick you tails into the snow and toss the rope downslope, skier clips on with a half hitch and self belays down the slope, the descending skier should be under tension. first skier down can place the rope a bit better. Used by guides to get their clients quickly over steep and exposed sections where they don't want to lose them (unless they've paid in advance, of course)