Freudian slip.
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Initial idea was that any time a bomb explosion went off, rocks would fall.
But their purpose is not to be a defense but instead to encourage movement and activity.
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Could do both defense and movement concepts, but it's really up to you guys. I think there's a game where you destroy pillars and the stuff comes down from the ceiling where I can't remember the name of the game, or I might be imagining it.