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.