This is a video taken by Ben Riesman from Park Row, showing the northeast corner of the South Tower. The video zooms in at this moment and shows the floors engulfed in flames from the impact of the second tower, before it collapsed. At 00:37 in the video, inward bending of perimeter columns at the north and east face progresses further. Top third of the South Tower begins to lean eastward and fall, total collapse starts. The South Tower (wtc 2) collapsed in about 10 to 11 seconds after burning for 56 minutes. United Airlines Flight 175 struck the tower at 9:03 a.m., and it collapsed at 9:59 a.m. #neverforget