In the still cold air of the snow-filled couloir, there came an utterly hair-raising musical sound&mdashencompassing the click of a castanet and the ping of a tuning fork. Alam Chand froze for a split second, then shouted, &ldquoRun, run, stones&rdquo He and Bhagat Ram ran to the side of the couloir and flattened themselves against the rock wall so they were sheltered by the protruding ledges and overhangs of rock above. The stark terror on their faces was a lesson in itself. Arun and I followed with our hearts in our mouths. A couple more pebbles went past and then a rock about the size of a tennis ball hurtled down, ricocheting on the boulders. We waited, paralysed. No more stones. As the silence and stillness returned, we peeled ourselves away from the rock wall and returned to the large boulder on which we had been resting.

