When Mutassim Abdulsatir arrived at Syria's Sednaya prison, accused of so-called state terrorism activities, he stepped into a world of terrifying violence. "We would lie flat on our bellies like this," he said as he spread his arms over a dirt-floor room. "We'd get hit with pipes over and over again… until some of us died," he told Margaret Brennan, on assignment for a 60 Minutes interview with Syria's new president, Ahmed al-Sharaa .  Abdulsatir was then brought to a dark basement, where he