tragedy averted on a train bound for paris thanks to three americans and a british passenger who jumped in to subdue a gunman. those americans, an airman, national guardsman and civilian are being hailed as heroes for taking down the shooter who emerged from the bathroom shirtless with a rifle slung over his shoulder. he is now identified as ayoub el khazzani. he may have traveled to turkey to join a french isis group. what incredible bravery they showed. >> i think you and i consider this true heroism but then you hear from these men and their families and they call it basic instinct, something that in their words, anybody would do. but call it what you want, the fact is that had these men not taken these actions, we would be