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So at the end of The Lost Metal, with a duralumin spike, wax pushes off the top of a skyscraper and makes it to the ship miles away. It specifically says that the steel beams are bent backwards. This got the engineer in me thinking. How large are steel lines. Stress is equal to force over area and the size of the steel lines affects this greatly. A second question with this is: can a coinshot push off of multiple steel sources right next to each other in order to get a stronger push?

I've been thinking about mechanical engineering on Scadrial and was hoping someone could set me straight so that I can daydream accurately: First, and more simply, would it be reasonable to assume that a Lurcher could potentially learn to use an "Iron Bubble" a la Wax's "Steel Bubble", whereby they Pull on all metals around them generically? Second, when Allomancers use Iron and Steel could a sheet of aluminum effectively block other metals from the iron/steel sight by "line of sight" (from the chest, of course ) alone or would the aluminum have to completely encapsulate the other metal to hide it from iron/steel sight? Clarifying questions to second, assuming answer is "line of sight" as I suspect: Would the thickness of the aluminum be a factor in the ability to detect metal on the other side of it?