Quote from Bitstream:
as usual great post, full of quality content.
the plane impact didn't damage the main supports, even the nist knows that. it was the heat according to nist that caused the floors to sag and the columns to bow. u obviously haven't read a page of that report.
maybe u also forgot or most likely didn't know that the towers were built with multiple plane crashes in mind.
Obviously you didn't read Nik's post.

He didn't say that the planes damaged the main supports. He said that if you sliced the main support than the floors above would collapse. How you sliced them, of course, is the matter of debate.