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Input: Spencer Stone  Anthony Sadler and Alek Skarlatos had been thrilled when Clint Eastwood bought the rights to their book about the events on a Thalys high speed train in northern France in August 2015.
Image copyright  AFP Image caption Spencer Stone  leaves the Lesquin hospital after treatment
Image copyright Warner Bros Image caption Judy Greer (left) plays  Spencer Stone 's mother and Jenna Fischer plays that of Alek Skarlatos
"It was at a ceremony the year after the attack  " Stone  recalls. "And afterwards we all huddled up and decided we needed to say something to  him . So we went back into the greenroom and said we have this book coming out and you should make the movie! So Mr Eastwood said to send  him  the book and gave us  his  address."
 Image copyright Warner Bros Image caption Spencer Stone  opted for an army career as did Alek Skarlatos
After school both  Stone and Skarlatos  opted for military careers - Stone in the US Air Force and Skarlatos in the Oregon Army National Guard. Did that military experience influence their split-second decision to try to take down El-Khazzani when he was intent on carnage?
 Image copyright Warner Bros Image caption Spencer Stone (right)  says  he  was driven by fear for  his  life
Stone  who moments before had been dozing  charged down the train aisle as El-Khazzani levelled an assault rifle at  him .
But the weapon didn't fire  possibly because a bullet was faulty.  Stone  ended up with severe gashes to  his  neck and thumb after El-Khazzani lashed out with a box-cutter as they struggled hand-to-hand. Skarlatos and Sadler came to  Stone 's assistance.
"I wasn't really thinking about everyone else: I was just thinking about  myself  " says  Stone . "I just saw that something had to be done.

How Clint Eastwood made screen stars of have