He rose to his feet on the instant and saw the woman also lift herself from the grass as if moved by a similar impulse. In his intense preoccupation he had failed to observe the signs of the times. A sense of the overcast sky came to him suddenly, as it did to her, but with a difference. He knew what was about to happen, his experience told him much more as to the awful potentialities of the tempest than she could possibly imagine. She must be warned at once, she must leave the cañon and get up on the higher ground without delay. His duty was plain and yet he did it not. He could not. The pressure upon him was not yet strong enough. A half dozen times as he watched her deliberately sitting there eating, he opened his mouth to cry to her, yet he could not bring himself to it. A strange timidity oppressed him, halted him, held him back. A man cannot stay away five years from men and woman and be himself with them in the twinkling of an eye. And when to that instinctive and acquired reluctance against which he struggled in vain, he added the assurance that whatever his message he would be unwelcome on account of what had gone before, he could not force himself to go to her or even to call to her, not yet. He would keep her under surveillance, however, and if the worst came he could intervene in time to rescue her. He counted without his cost, his usual judgment bewildered. So he followed her through the trees and down the bank. Now he was so engrossed in her and so agitated that his caution slept, his experience was forgotten. The storm in his own breast was so great that it overshadowed the storm brewing above. Her way was easier than his and he had fallen some distance behind when suddenly there rushed upon him the fact that a frightful and unlooked for cloudburst was about to occur above their heads. A lightning flash and a thunder clap at last arrested his attention. Then, but not until then, he flung everything to the winds and amid the sudden and almost continuous peals of thunder he sent cry after cry toward her which were lost in the tremendous diapason of sound that echoed and re-echoed through the rifts of the mountains. "Wait," he cried again and again. "Come up higher. Get out of the cañon. You'll be drowned." But he had waited too long, the storm had developed too rapidly, she was too far ahead of and beneath him. She heard nothing but the sound of a voice, shrill, menacing, fraught with terror for her, not a word distinguishable; scarcely to her disturbed soul even a human voice, it seemed like the weird cry of some wild spirit of the storm. It sounded to her overwrought nerves so utterly inhuman that she only ran the faster.