>> they were clear in what they were trying to accomplish. >> isis's unbridled brutality yielded huge gains on the battlefield. the group would soon declare it had carved out a caliphate, the size of michigan according to u.s. authorities ruled under its version of sharia law. unez denies committing atrocities in syria. you didn't commit any crimes while you were there? >> no. >> it's hard to fathom how anyone can endure tactics so ruthless that even al qaeda --