It becomes visible at about the 2 second mark, then kind of swirls around and disapears after the crash. It reminds me of a piece of paper or
smouldering debris from the first tower but it's way too big for that.
Also it wouldn't disappear, and is on the wrong side of the building to be from the first impact. Just weird that's all.
Maybe it was the red bandanna and the lighting of the day only made it appear white....
More realistically I would think it is a high grade explosive, Maybe thermite, maybe something else but powerful enough to burn white with enough
force to blast through an existing fireball as it cuts through steel.
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