the french president at the presidential palace. polo sandoval has more details for us. it s a pretty remarkable story all the way around on how these young men ended up on that train. they re friends traveling together in europe and then they were really tested, weren t they? reporter: truly at the right place at the right time, fred. we already heard from alek skarlatos yesterday and anthony sadler. today we get to harear from tha third hero himself exactly how he was able to confront this gunman. it feels very unreal. it fields like a dream. reporter: bearing the visible reminders of a bloody confrontation, u.s. airman spencer stone relives the moment he led a charming against a gunman on board a french train. i turned around and i saw what looked to be an ak-47. he looked like it was jammed or it wasn t working. he was trying to charge the weapon. alek just hit me on the shoulder and said let s go. reporter: those two words