outside downtown boston, just along this strip. it began with suspect tamerlan tsarnaev knocking on the window of the victim s car and demanding a ride. it played out for about 90 minutes and left the victim shaking. tamerlan tsarnaev, according to the victim, wielded a silver handgun when he climbed into the black mercedes suv. the suspect s first words said, did you hear about the bombing, the marathon bombing? danny said, i did. he said, well, that s me. i did that, and i just killed a cambridge cop. referee: proppiesoris james fox, a criminologist at northeastern university, has counseled the victim and knows every detail of the story. the victim, a chinese national, did not want on camera, would only agree to be referred to by his american nickname, danny. he gave a description of the carjacking to the boston globe co which professor fox confirmed to cnn. the victim said he pulled off to the curb tamerlan in the passenger seat, dzhokhar tsarnaev was following in another