JONATHAN ALLEN A prosecutor told the jury that former Minneapolis policeman Derek Chauvin betrayed his badge and murdered George Floyd in last year's deadly arrest as closing arguments began in Chauvin's trial. Over and over again, Steve Schleicher, a prosecutor with the Minnesota attorney general's office, repeated a phrase: "Nine minutes and 29 seconds," — the length of time Chauvin was captured on video on May 25, 2020, kneeling on the dying Floyd's neck. Schleicher emphasized that the jury was weighing the guilt of only one man, although their verdict will nonetheless be widely seen as a reckoning in the…