>> just a few moments ago, world trade center building number 7 collapsed. earlier, we were warned by firefighter sources that the building was in danger. engineers were on the scene and they say that the building was structure structurally very weak. >> all they did was come to work that moirpg. that morning. they didn't come to do battle. >> the people who went to vietnam knew what that they were doing. they were trained for that. you don't expect that, going to work at the pentagon in an office. >> he was already very focused and calm. it was remarkable to me. he was not shaken in that sense. the one moment that i could see the horror in his face and his eyes was when that famous picture of andy heart telling