What destroyed the World Trade Center?
If by "fumes" you mean "smoke," yes, brilliant observation. Smoke is caused by fires, not mythical beam weapons. WTC7 suffered several large fires (not small, insignificant ones as often claimed). Interesting that the very same series of NYPD photos which you use to illustrate "minor damage" also indicate quite major damage to the building's southwest face, including this one:http://www.911myths.com/assets/images/WTC7Corner.jpg
Smoke?!?! Why isn't it going out the damaged windows? The path of least resistance? It's one side only all day... Oh the wind? Was it blowing inside the building? Causing the 'smoke' to not even leak out of broken windows in the exact corner you referenced? I think it's pretty strange behaving smoke honestly. My opinion.