"Wind, weather, power, load - gradually these elements stop churning in my mind. It's less a decision of logic than a feeling, the kind of feeling that comes when you gauge the distance to be jumped between two stones across a brook. Something within you disengages itself from your body and travels ahead with your vision to make the test. You can feel it try the jump as you stand looking. Then uncertainty gives way to the conviction that it can or can't be done."