my limited understanding of the thermitic welding technique comes from what I've learned thru trying to tear down down my own perceptions of the truth of what happened that day. Possible, but highly unlikely

The thermitic reaction takes place at over 3000 degrees which is practical for repairing things such as train rail, but not so practical during the construction of a skyscraper.

Do I hear a third theory as to where this material may have come from? The report is fairly explicit...