@Glennn,
Where did I push that idea? You are putting words into my mouth.
There are all sorts of things that might have happened.
1) What you are calling the lower block may have already been falling by the time the upper block was falling.
2) The connection of the lower block may have already been weakened enough that it didn't take much energy to detach it.
3) The energy of the upper block may have been high enough that the collision wasn't noticed.
4) The positioning of the video you are relying upon might be masking something.
5) You may be misinterpreting the orientation of the blocks, or the video, or the science.
6) The Extra-terrestrials may have already "neutralized" the lower block as a side effect of beaming their outpost to safety on a waiting mother ship.
7) Or ghosts.
Or ....
8) Thousands of pounds of military grade secret thermite may have been put by hundreds of secret agents onto the pillars of the buildings months in advance, along with holographic projectors and a super advance sound projection system in order to project twin jet airliners onto the buildings in a way convincing enough to fool several hundred onlookers.
All of this was done in secret along with the cooperation of air traffic controller (or hackers who were good enough to fool them), and none of the blew the whistle (any one of them could have ruined the whole plan).
And all of this grand plan was pulled off without a hitch... except for one thing...
they forget to adjust the speed of one ******* antenna on a YouTube video.
But then again, not even a vast military conspiracy run by the government can be completely perfect.
Of all of those theories.... I think the extraterrestrials are the most compelling.