I used to have to carry the various explosives for any explosive ordnance disposal team that might embark on the boat one of the items I had to stock for them was linear shape charge rolls. one just cut to length a piece of the stuff prime with a blasting cap and it would easily cut through steel plate in excess of 3/8 inch. that was a full 12 years prior to 9/11 and the boat I was on didn't require any of the real neat stuff they'd play with.
I'm ashamed to say it, but I've never seen video of molten steel pouring from the Twins prior to this one.
I first saw it some time ago and it was for me an instant red flag more than many other items cited as suspicious. Many other things could be somewhat argued away in various subjective levels, but the molten steel flowing out of the towers has no subjective or objective explanation I've ever heard put forth, except the thermite one.