Having to make up lots of ground on the anchor leg, Bolt suddenly screamed and stumbled as he came down with his golden farewell shattered by the first injury he has experienced at a major competition.
That wasn't the only surprise. Britain went on to beat the United States in a tight finish.
The 60,000-capacity stadium was primed for one last Bolt show, one last ``To the World" pose after a victory, but the injury made it blatantly clear why Bolt is ready to retire. His body can no longer hold up.