I'm not really sure what the mystery is here. It fell because it had 110 stories of debris come at it from across the street. The building suffered, amongst fire and other things, a 10 story vertical gash from pieces of WTC1 coming down. Just imagine the force of impact required to cut through 10 stories in the face of a building. It's not surprising it fell, it's surprising it stood as long as it did.
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