"a free fall time would be an object that has no structural components below it"
All you're doing here is misinterpreting the phrase "no structural components". It doesn't mean they have gone entirely, or have all fallen over onto the floor well out of the way. It just means they are no longer structural. A column broken at a weld and leaning over at 20° is not 'structural' any more.
See NIST NCSTAR1-9A , page 88, pdf page 138, final paragraph.
