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The building? and at what point do you deem the structure of the building to be either safe to continue operations inside of it or do you kind of wait it out and say, hey, we're not sure which way this is going to go? >> well, they got to call structural engineers to the site of the fire. they cannot -- until they get a structural engineer to analyze that building, the fire service will continue to supply the sprinklers and the standpipe system, they will make limited interior searching, but they will be concerned about the structure. these buildings do collapse. they may have localized minor ...

Building that that is false? you think that that is false? >> yes, do i. and for a couple of reasons. one is that building seven came down, it went into a sudden collapse across the full width and length of the building. 2.25 seconds which amounted to 105 feet or eight 13-foot tall storeries. it was in full free flow acceleration. that is impossible because in a natural collapse columns would have to buckle. when columns buck there will is a minimum resistance. it means it never goes to zero. it is impossible. you can't reach -- >> here is in lay men's terms. what he is saying is that the top ...