>>> plus, a knock on your window. then, carjacked. the boston carjack victim, taken for a midnight ride of terror. >> you have no no idea what's going to happen. >> exactly. other than you think you're probably going to die. >> how he saved himself and maybe hundreds more. tonight, do you follow, do you fight or do you flee? when life changes in an instant. here now, david muir and elizabeth vargas. >> good evening. new york city could have been next. that is what investigators are now saying was the next target for bombing suspect dzhokhar tsarnaev, who tonight is in fair condition after being transferred from a boston hospital to a medical facility in a state prison. >> of course, so many asking tonight, elizabeth, what if those brothers made it to new york to times square. the crowd chaos could have been boston all over again. so, what decision do you make in indiana stand, when it can make the differences between life and death? here's matt gutman. >> reporter: there is a...