if you actually want to know what caused the bowing, it was the floor trusses, being heated by the fires beyond what they were capable of supporting their own weight
they sagged and pulled the sides in till the floor truss supports failed
then the collapse began
how hot were those fires ??...and how can this woman stand in the impact zone moments before he collapse ?
because the wind was blowing TOWARDS her
the heat was being blown away
see, if you had rational thought you would understand that
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