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I think it is not as much a matter of one intentionally avoiding contact with a collapsing roof by sliding to the side as a reaction, which, as you say, is probably not possible given how quickly such a scenario would play itself out, but more a matter of when the roof makes contact with you (your helmet initially), is your body free to move to the side (assuming you somehow survive the impact), or will it be somewhat restrained and crushed in the process...
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