South Tower huge wall still standing - World Trade Center 9/11

Interesting footage showing a very tall outer perimeter wall did stand alone for a few seconds during the collapse of the South Tower 9/11 World Trade Center attack - I incorrectly inverted the names of the towers in the video
Source 10:00 https://www.youtube.com/watch?v=5SdkQcv2xms Notice in this linked video at 15:40 when the core of the North Tower has finished collapsing, you can see a very tall structure (taller than WTC 7) collapsing about 2-3 seconds later - large shadow moving to the left and down. It seems same thing happened with both towers, one or more very tall faces did stand alone a few seconds after the collapse of the core and floors