Nice dodge by calling it a straw man. It is your guys' claim that jet fuel caused the exposions in the lobby. I just explained how that's ridiculous. Also ridiculous is claiming that the top fifth of the building is somehow stronger than the bottom 4/5 because that's what you just did. Somehow, when the top fifth fell, it maintained its structural integrity enough to destroy the rest of the building. Newton's 3rd law my friend.