>>>What do you mean by 'deliberate' ?
>>
>>Opposite to "random"... but I may be misreading.
>>
>>>Where did you get 'simultaneous' from ?
>>
>>If a flat object is held by its edges, and then the holding points vanish, the object will start falling first on the side which gave first; if you want it to fall without tilting, you need to remove all the support points at the same time. Try that with a book, let it make a bridge between two desks of equal height, and then try to move away one of the desks. Good luck with getting the book to fall without tilting.
>>
>>So if the clips were the cause, they had to fail at the same time, or else the floors wouldn't go down so perfectly.
>
>A book is not a high tonnage concrete floor with a width and bredth of over 50 feet. One clip then another failed and so on until the floor fell only eight feet to the next floor. Yes it tilted a bit and then another clip failed and then another clip failed - the layer fell, perhaps tilted or broken from the strain, on to the floor below it where it's weight was added to the collapse. Before tilt and toppling sideways could occur weight and size overcame the titing and the collapse remained vertical.

So all the floors in all three buildings self-corrected?

Even in controlled demolitions, the slightest error (such as one charge firing out of order or not at all) can cause toppling. This is just too perfect. I am not convinced.