Isaiah Jewett, of the United States, and Nijel Amos, right, of Botswana, fall in the men's 800-meter semifinal at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo. (AP Photo/Jae C. Hong)

Isaiah Jewett, of the United States, and Nijel Amos, right, of Botswana, walk off after falling in the men's 800-meter semifinal at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo. (AP Photo/Jae C. Hong)

Isaiah Jewett, of the United States, and Nijel Amos, right, of Botswana, shake hands after falling in the men's 800-meter semifinal at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo. (AP Photo/Jae C. Hong)

Isaiah Jewett, of the United States, and Nijel Amos, background, of Botswana, fall in the men's 800-meter semifinal at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo. (AP Photo/Jae C. Hong)

Isaiah Jewett, of the United States, and Nijel Amos, right, of Botswana, shake hands after falling in the men's 800-meter semifinal at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo. (AP Photo/Jae C. Hong)

Isaiah Jewett, of United the States, and Nijel Amos, of Botswana, fall in the men's 800-meter semifinal at the 2020 Summer Olympics, Sunday, Aug. 1, 2021, in Tokyo.(AP Photo/Jae C. Hong)