This year ABC7NY published some video that seemed new to me. Source: https://www.youtube.com/watch?v=OQk5Qw8hHGA The video starts familiarly, with Dr Mark Heath, who got caught up in the WTC1 collapse, and then helped people. But from around 6:20 I don't remember seeing this footage, at least not in this quality. The top photo I extracted from short bottom to top-pan of WTC at 8:40, then the cameraman zooms in, and pans down, providing a detailed look at the damage to the SW corner, looking at the West face. I was able to take a perspective correct crop of this: Some of the distortion there is due to the camera warping, but you can see the corner gouge goes three windows deep.