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A strong wind arises and the ominous sound of thunder rolls across the forest, causing the ground to tremble beneath your feet. You look to the darkening sky and see distant flashes of lightning illuminating a bank of thick cloud that is sweeping in from the west. A violent storm is approaching and droplets of rain are already beginning to spatter your head and shoulders.
You hurry along the ravine in search of shelter from the coming storm. Lightning is striking closer, forking down into the forest with spectacular effect. You have barely covered a mile of the shallow ravine when it ends abruptly at the edge of a deep gorge. Less than a hundred yards away to the west, you can see a rocky knoll with a slate base that juts out over the rim of this steep valley. To the east, the gorge cuts a deep furrow through the timberland for several miles. There is no easy way to avoid the gorge, but equally you have no wish to descend it during a storm. The rain is getting heavier and the lightning strikes are increasing, and so you decide to seek safe shelter at the rocky knoll.