Up to that point, most of us had never faced a decision more difficult than what subject to study at school, whether to start or end a relationship, whether to accept or reject a job offer. But up there in the snow, with our bodies exhausted and on the brink of starvation, laboring to breathe the oxygen-deprived air, we had to decide whether or not to eat the flesh of the dead who surrounded us, and that decision was nothing short of the choice between life and death itself.