[kahljorn]

yea i think they are saying the way the building fell worked on the same premise as a demolition basically. The structural intergrity was warped due to the fire melting the steel, it wasn't from the small chip in the side. Since it was an overall weakening it made it "Buckle" on top of itself like if your knees give out sort of. Same concept with controlled demolitions I'd imagine.

One game I'd reccomend geggy is Janga you can learn all kinds of dynamics of things falling.