“Oh and it’s not “at the beginning of the fall”; it’s several seconds after the penthouse fell through the roof.
Sorry, who is being selective with the data here?”
I answered your question :
Could you please explain to me, as I asked above, how WTC7’s initial 0.5 seconds of descent at uniform velocity could possibly be consistent with collapse initiated by explosives?
I’ve got nothing further to say on this point. Others can judge who’s been selective.