Depends on the angle of the slice 2 the building. Yes, i said it, but i said it in a way that, if the conditions were right as they were that morning. That the slice 2 the top, caused a ripple effect of vibrations 2 the puttified structure up top. The structure was solid, the top was heavy, and what a few floors had been knocked out. An unstable structure (where the plane hit), with a heavy roof that can't support the weight it carries. I know buildings don't fall str8 down, they tend to lean a tad bit. I was sure the towers fell in a vertical manner. So, then 1500F was close 2 the temp of the burn in the towers, bout 2/3rds the way. Plenty of heat 2 cause a flex, but I also see what your saying too.