Okay lets address each one:
He's a Blacksmith and keeping your forge at a constant temperature is important - not ideal for a true scientific test, but the principle is clearly demonstrated.
So you have the exact weight of fuel that burnt off in the Fireball and that was left in the tanks, and based on the difference between those 2 figures, worked out the weight of fuel that was left over and determine that the energy output of that fuel wasn't sufficient to weaken the Steel Structure? (not to mention all the other combustable things found in offices) or are you basing the statement on what you think occurred?
I really haven't - if you look closely at the video, you will notice, when the Blacksmith stands in front of his Forge (at 1800 degrees, so hotter than Jet fuel) that he doesn't spontaneously combust. Also consider that there are numerous videos on the internet of Blacksmiths working in front of their Forges - and they don't spontaneously combust either!
Steel is a fantastic conductor of heat - if you put a thick steel frying pan on a heat source and touch the very edge of it with bare hand - let me know how that goes.
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