The next two obstacles

The next two obstacles, the water course and the barrier, were easily crossed, but Vronsky began to hear the snorting and thud of Gladiator closer upon him. He urged on his mare, and to his delight felt that she easily quickened her pace, and the thud of Gladiator's hoofs was again heard at the same distance away.
Vronsky was at the head of the race, just as he wanted to be and as Cord had advised, and now he felt sure of being the winner. His excitement, his delight, and his tenderness for Frou-Frou grew keener and keener. He longed to look round again, but he did not dare do this, and tried to be cool and not to urge on his mare so to keep the same reserve of force in her as he felt that Gladiator still kept. There remained only one obstacle, the most difficult; if he could cross it ahead of the others he would come in first. He was flying towards the Irish barricade, Frou-Frou and he both together saw the barricade in the distance, and both the man and the mare had a moment's hesitation. He saw the uncertainty in the mare's ears and lifted the whip, but at the same time felt that his fears were groundless; the mare knew what was wanted. She quickened her pace and rose smoothly, just as he had fancied she would, and as she left the ground gave herself up to the force of her rush, which carried her far beyond the ditch; and with the same rhythm, without effort, with the same leg forward, Frou-Frou fell back into her pace again.
"Bravo, Vronsky!" he heard shouts from a knot of men--he knew they were his friends in the regiment--who were standing at the obstacle. He could not fail to recognize Yashvin's voice though he did not see him.
"O my sweet!" he said inwardly to Frou-Frou, as he listened for what was happening behind. "He's cleared it!" he thought, catching the thud of Gladiator's hoofs behind him. There remained only the last ditch, filled with water and five feet wide. Vronsky did not even look at it, but anxious to get in a long way first began sawing away at the reins, lifting the mare's head and letting it go in time with her paces. He felt that the mare was at her very last reserve of strength; not her neck and shoulders merely were wet, but the sweat was standing in drops on her mane, her head, her sharp ears, and her breath came in short, sharp gasps. But he knew that she had strength left more than enough for the remaining five hundred yards. It was only from feeling himself nearer the ground and from the peculiar smoothness of his motion that Vronsky knew how greatly the mare had quickened her pace. She flew over the ditch as though not noticing it. She flew over it like a bird; but at the same instant Vronsky, to his horror, felt that he had failed to keep up with the mare's pace, that he had, he did not know how, made a fearful, unpardonable mistake, in recovering his seat in the saddle. All at once his position had shifted and he knew that something awful had happened. He could not yet make out what had happened, when the white legs of a chestnut horse flashed by close to him, and Mahotin passed at a swift gallop. Vronsky was touching the ground with one foot, and his mare was sinking on that foot. He just had time to free his leg when she fell on one side, gasping painfully, and, making vain efforts to rise with her delicate, soaking neck, she fluttered on the ground at his feet like a shot bird. The clumsy movement made by Vronsky had broken her back. But that he only knew much later. At that moment he knew only that Mahotin had down swiftly by, while he stood staggering alone on the muddy, motionless ground, and Frou-Frou lay gasping before him, bending her head back and gazing at him with her exquisite eyes. Still unable to realize what had happened, Vronsky tugged at his mare's reins. Again she struggled all over like a fish, and her shoulders setting the saddle heaving, she rose on her front legs but unable to lift her back, she quivered all over and again fell on her side. With a face hideous with passion, his lower jaw trembling, and his cheeks white, Vronsky kicked her with his heel in the stomach and again fell to tugging at the rein. She did not stir, but thrusting her nose into the ground, she simply gazed at her master with her speaking eyes.
"A--a--a!" groaned Vronsky, clutching at his head. "Ah! what have I done!" he cried. "The race lost! And my fault! shameful, unpardonable! And the poor darling, ruined mare! Ah! what have I done!"
A crowd of men, a doctor and his assistant, the officers of his regiment, ran up to him. To his misery he felt that he was whole and unhurt. The mare had broken her back, and it was decided to shoot her. Vronsky could not answer questions, could not speak to anyone. He turned, and without picking up his cap that had fallen off, walked away from the race course, not knowing where he was going. He felt utterly wretched. For the first time in his life he knew the bitterest sort of misfortune, misfortune beyond remedy, and caused by his own fault.
Yashvin overtook him with his cap, and led him home, and half an hour later Vronsky had regained his self-possession. But the memory of that race remained for long in his heart, the cruelest and bitterest memory of his life.