Yeah well the documentary broke everything down and had plenty of examples to back conspiracies in my opinion.
I don't know If I believe it either but here's another reference..
they used this in the documentary as well.. it's from 4 different angles a flash went off just before the planes hit the towers.. really odd.
A few videos have firefighters saying it reminded them of demolition charges while they were inside..


http://www.youtube.com/watch?v=wSlKoa1e0UE

I recommend the documentary if you like second opinions.. actually if you're interested just search 911 in plane sight part 1 on youtube
the full video is on there in parts.