Fake audio. Explosion is heard simultaneously with the flashes from the explosives. Dubious background story too. Found on a camera after 11 years? Give me a brake. Do you have any idea how easy it is to crate an animation like this on a computer? Anyone can do it.
Get out of the virtual reality, this is just another animation.
Non of the many WTC7 collapse videos have consistent audio tracks.
Why is it so much easier to fool people than it is to convince them they've been fooled?