There was no one moment, no one place when she made the decision to go for it. The trees became thinner and thinner, the sight lines became clearer and longer, the ground angled more and more steeply under her feet. Minutes ago, she had been running across nearly level ground. But now she noticed that she was scrambling, almost on all fours, up a talus slope; looking back and down to judge her progress, she saw a good quarter of a mile of perfectly open ground behind and below her, terminated in the distance by a fringe of scrubby undergrowth that shortly developed into proper forest.