Key legal question
Whether the snow-tubing incident satisfied the statutory accident requirement, especially the unusual external factor element.
Extracted holding
Yes. The final descent differed from the planned course because she slipped into the tube and hit the icy track with her coccyx; this programmed-violation in the movement made the external factor unusual.
Extracted reasoning
In sports activities, an accident exists only if the exercise deviates from the planned course. Here, the unintentional slipping into the tube caused unplanned contact with the piste and several impacts, so the injury was not merely the realization of an inherent sporting risk.