LONDON — Usain Bolt was ramping into warp speed when suddenly, stunningly, the sprint turned into a somersault.Fifteen steps into the final homestretch of his final race, something gave in his left hamstring. The World's Fastest Man skittered to a stop — hopping, skipping, jumping, then finally dropping to the ground and tumbling forward before coming to a rest.While the winning team from Britain crossed the finish line, Bolt was writhing on the track, where he eventually wound up chest down with his face pressed into Lane 5. He was certainly every bit as stunned as any of the 60,000-plus who packed the stadium Saturday, or the millions watching one of the world's most entertaining showmen make his final curtain call in the 4x100-meter relay at...
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Bolt takes a tumble and can't complete final race at worlds