Nothing to do with the melting steel, i'm talking that "stuff" flowing out of the side of the tower again. It's shown glowing orange and dripping off silver further down... ie: aluminum, lead, solder, etc.
A propane torch doesn't matter if you have a pocket lighter sized tank or the Exxon Valdex, the flame only burns so hot regardless of volume. Any fuel fire does that. Bigger volume will burn bigger and longer creating more residual heat... but it still won't puddle aluminum like that.
edit: International flights? And here i thought LA was still considered to be a US territory.
