Sonny may be an expert on explosives but his self-proclaimed knowledge of structures and their demolition is deficient. His assertion that demolishing 8 "pylons" will bring down the structure but the existence of a 9th will save the entire structure is impossible (a structure would never be built with nine supports if only one would do). Furthermore, the team proceeds to damage the ninth "pylon" by running a truck into it and causing cracking and spalling along the outside of it. The team then proceeds as if this was enough to cause the ninth column to collapse when the other eight were blown up. But the damage caused by the truck would have had no effect on the structural integrity of the column, since the concrete outside the reinforcing steel is known as "cover" and is only there to protect the reinforcing steel from corrosion. It has no structural significance.