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Cutter charge apparent at WTC, stabilized and repeated three times (not cropped). Compare what you see flashing on the column here, to the flame produced by the linear thermite cutter here: http://www.youtube.com/watch?v=Wn-MCCZ3O1M Also note the white "streamer" that peels from the same location, somewhat like a fuse, just prior to ignition. Extracted from an extraordinary clip released by NIST in response to FOI: http://www.youtube.com/watch?v=Ne1FJBVkh4s