the middle and 8-year-old martin on the end are seen balanced on the metal barrier, blissfully unaware of the man in the white hat behind them. dzhokhar tsarnaev slipped away secondses before detonating the device. richard frantically tried finding his family grabbing his daughter whose leg had blown off. he testified i looked at martin for the last time. >> the carnage was similar at the finish line. >> he waswhen he heard the second blast he testified, it clicked. i knew we were under attack. bowman testified in court he'd seen a suspicious-looking man next to him. both are seen here under the red and white flag. when he turned the man's bag was on the ground but the man wearing aviators and a black hat was gone. a dai after the bombing from his hospital bed bauman scribbled a note. i saw the kid. i know what happened.