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I emerged from the dark recesses of the forgotten cave and found myself in the red and purple twitter-light. The mountainside was silent, but that meant nothing. Many explorers had learned, to their folly, that the natives of this terrible place could move as shadows when it suited. I squinted into the fading light. Seeing nothing, I bent all my efforts to penetrating the wall of silence, hoping to hear the sound of shifting stones that would indicate another presence, I heard nothing. It was when I reached my climbing gear that I heard a pebble bouncing down the mountain.