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On his final day testifying against members of his former gang, the rapper known as Tekashi 69 (or 6ix9ine) reprised for jurors how he escaped from a car that had been used to abduct him, then dashed through the streets of Brooklyn and threw himself into a strange vehicle while begging the driver to speed off or else “I’m going to die.”

He had suggested in the past that the kidnapping attempt had been a sign that his efforts to gain street credibility by associating with gang members had put his life in danger.

But in court on Thursday, he offered a fuller recounting of that night when, he said, his former bodyguard, Anthony Ellison, and another man kidnapped and robbed him.

Defense lawyers in the racketeering trial of Mr. Ellison and another member of 6ix9ine’s former crew, the Nine Trey Gangsta Bloods, scrutinized the rapper’s account, raising questions about his credibility. One lawyer referred to the account as “this supposed incident where you were supposedly robbed.” Another cast him as a publicity hungry provocateur.