The video questioner asks the NIST guy if there is any evidence of molten steel and he says no. Steel becomes molten at 2,600 hundred degrees farenheit and the temperature of the fire in the building before it collappsed never got above 1,800 degrees farenheit. There are other metals that melt at 1,800 degrees or below; aluminum, brass, bronze, lead, magnesium, silver, tin, and zinc. Airplanes are made primarily of aluminum and if there was any molten metal falling from the building, as suggested by the video, then it was most likely aluminum.
The questioner says that eyewitnesses so 'huge pools of molten steel beneath the towers' (which would be after the collapse), but fails to provide one eyewitness who actually said that. Two firefighters say they saw molten steel running down a channel like lava. Never did they say they saw huge pools of molten steel and there is no evidence to suggest they know the differnce between molten steel and other molten metals. The rest of the eyewitnesses in the video talk about the temperature reaching 1,100 degrees and 1,500 degrees and the core looking like an oven, but none of them talk about molten steel.
If you are trying to make a point it is best to put your best evidence forward. If that is your best evidence it is pretty lame.
http://wtc.nist.gov/pubs/factsheets/faqs_8_2006.htm 13. Why did the NIST investigation not consider reports of molten steel in the wreckage from the WTC towers?
NIST investigators and experts from the American Society of Civil Engineers (ASCE) and the Structural Engineers Association of New York (SEONY)—who inspected the WTC steel at the WTC site and the salvage yards—found no evidence that would support the melting of steel in a jet-fuel ignited fire in the towers prior to collapse. The condition of the steel in the wreckage of the WTC towers (i.e., whether it was in a molten state or not) was irrelevant to the investigation of the collapse since it does not provide any conclusive information on the condition of the steel when the WTC towers were standing.
NIST considered the damage to the steel structure and its fireproofing caused by the aircraft impact and the subsequent fires when the buildings were still standing since that damage was responsible for initiating the collapse of the WTC towers.
Under certain circumstances it is conceivable for some of the steel in the wreckage to have melted after the buildings collapsed. Any molten steel in the wreckage was more likely due to the high temperature resulting from long exposure to combustion within the pile than to short exposure to fires or explosions while the buildings were standing.