WTC1 Collapse & WTC7 hit by Debris - Unkn./ABC - Raw Ftg. from NIST (Enhanced/Audio Replaced)

0:02 - Northern perimeter wall panels of WTC1 topple and hit WTC7 southwest corner at its upper floors, causing damage to the curtain wall. On the right edge, something, what appears to be a huge perimeter sheet (?) broke free and away from WTC1, near or with its NW corner panels, falls behind the Verizon Building. 0:12 - Upper portion of still standing WTC1 core remnant revealed. Note that its south half is not visible anymore and is likely already gone, including the three corner core columns 508A (NE), 1001A (SW), and 1008A (SE). NW corner core column 501A up to 75th or 77th floor is still dangling in the air for a brief period of time. Unknown videographer. Probably for ABC News or WABC-TV. View from northwest. POV: West stair of Tribeca Footbridge crossing over West Street. Audio is altered. Only a loud static noise can be heard in the non-enhanced version (). Another version with real native audio has been found on the ABC News tape “NYBS17891W“ as a low-quality/extended preview video on (Microsoft Silverlight is needed to get access). Audio has been taken from this source, increasing the loudness level. Screencaptured preview mirrored here: WTC1 collapse starts at 6mn:06s. Screencaptured tape description: That tape was apparently not obtained by NIST for its World Trade Center Investigation (Aug. 2002 - Nov. 2008). Source of video clip: , Folder: International_Center_for_911_Studies_NIST_FOIA [. NIST FOIA #09-42], 1st Lv. subfolder: Release_14_-_NIST_Cumulus_Video_Database, 2nd Lv. subfolder: NIST Cumulus Video - Original Files - Complete Uncompressed Set, 3rd Lv. subfolder: ABCNISTDubs 4th Lv. subfolder: ABC NIST Dub #3, Video clip: “ABC Dub3 “, File size: 230 MB. DV-AVI clip has been deinterlaced (by doubling the framerate) and resized to 1080p by keeping the display aspect ratio of 4:3. Contrast, brightness and saturation have been adjusted.