[Marnixvdb]

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Did you expect it to tip over like a tree? If the main load bearing structures have failed, where is the mass of the building going to go?

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Is the idea that a building can tip over so strange to you? It's the perfect implosion that is rare and extremely difficult to achieve. Tipping a building over is the preferred method of use of controlled demolition companies. They take away part of the load bearing structure and what happens? The building tips over. Uncontrolled collapses will usually show partial structural failure starting a chain of events that causes the builing to collapse. The most likely process is that the building tips over and breaks - or at the very least, shows an outward movement.

btw the Popular Mechanics article is not scientific in any way and is not conclusive.