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America's Got Talent" (Mon., 9 p.m. ET on NBC) is no stranger to danger and injury, but it's still devastating to see a group's chances in the competition come down to this. That said, it was because of a critical error during one of their high-flying stunts that 787 dance crew found themselves possibly down one member. Even should he return, it's possible the costly error could cost them their chance to advance in the competition.To ...