North Tower: southwest corner flash 20 minutes before collapse

After the South Tower collapsed, NYPD helicopters relayed information about the deteriorating conditions of the North Tower. At 10:20 am, the NYPD aviation unit reported that "the top of the tower might be leaning", and a minute later reported that the North Tower, "is buckling on the southwest corner and leaning to the south". At 10:28 am, the aviation unit reported that "the roof is going to come down very shortly".[26] The North Tower collapsed at 10:28 am, after burning for 102 minutes.

https://en.wikipedia.org/wiki/Collap...he_North_Tower

Video of bright flash originating from the southwest corner of the North Tower while it still stood:

https://www.youtube.com/watch?v=Wqq3PxPxqKA

https://www.youtube.com/watch?v=IjtLTkIZTnc&t=10m13s

I have never actually seen photographic evidence that the entire upper section of the North Tower was leaning to any degree. I used to think this was an optical illusion caused by the heat of the fires causing some perimeter parts to bend inward, but this is something I havean't seen until now.

More strange anomalies on the corners of the Twin Towers during the collapses:

https://www.youtube.com/watch?v=zoAD8HlrLZg

https://www.youtube.com/watch?v=ETntmSrT7g8

via International Skeptics Forum http://ift.tt/2Bda7Mc