Think about it like this...therma/ite devices...which emit extreme burning material...are basically like disposable torches. What's so hard to believe about burning material cutting through steel? You're all saying a torch can do it....well, what does a torch use to cut through steel?
Are you starting to see the forest?
How do you direct a thermite reaction like you would a torch flame and then get it to move laterally across a steel column?
How do you synchronise it so that the collapse progresses from the impact zone downwards? Especially when you can't be sure, in advance, which floor the impact zone will be on.
