You dont have to be to use your logical intuition.
WTC7 Compared to Controlled Demolition
The point we need to realize is how many cutter charges are need to make a building behave that way - accelerating collapse, with all sides and corners remaining straight and even, with huge dust clouds and puffs of ejected material down the sides. For these things you need explosives placed on every column, and on many floors at regular intervals.