Did anyone else think they were gonna kill themselves for a second?

Concrete isn't reinforced to withstand the weight, it's to withstand sideways forces like wind or impact (from a punch). The weight of the building is why concrete is used because it's good under load but that's not what the sideways punch is. The weight force of the building is sustained downwards and the concrete will resist that all day in a vacuum.

We often see the wights crumble to dust after being killed as though the magic is holding them together, that same magic that gets them up and moving makes them stronger and harder than they should be no matter how decomposed it seems. They've been shown to have pretty terrific strength at all times.

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