Hogfather - Crash

There was another shock underfoot. Snow flew up. The world tilted. She felt the shape of the boar change when its muscles bunched and sent it soaring as a slab of ice and rock came away and began the long slide into darkness.

Susan was thrown off when the creature landed, and tumbled into deep snow. She flailed around madly, expecting at any minute to begin sliding.

Instead her hand found a snow-encrusted branch. A few feet away the boar lay on its side, steaming and panting.

She pulled herself upright. The spur here had widened out into a hill, with a few frosted trees on it

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Hogfather - p338