"Blow up" is computer science jargon for nonlinear behavior in computer models causing values to increase or diverge so radically as to cause overflows. (Source:
http://www.catb.org/jargon/html/B/blow-up.html)
So apparently, he was commenting on the difficulty future researchers would have in running accurate computer models of the building collapse that was about to occur.
(Hey, a fireman using computer science jargon makes as much sense as a real estate entrepreneur using demolition jargon -- and in this case, at least the jargon in question really exists.)
Or perhaps there's also a firefighting jargon meaning of the phrase "blow up" that has nothing to do with explosives or explosions?
Nah, couldn't be.
Respectfully,
Myriad