While we're at that scene can I just mention something?
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Yeah, the bones won't, but what about soft tissues? If the hardest parts of his body won't break doesn't mean that the skin, joints, muscles and most importantly organs won't be grinded between his own bones and that crystal due to immense pressure.
That is why, on the rights of logic and sense, I announce this scene an official death of the MC. Everything that will be seen afterwards on Croixelle path is just his dream. That also 100% explains why he fainted after crysal broke down, he literally died lol.