Ensign Hudson still hasn't got into the mindset that allows impossible things to happen, despite the fact she is witnessing (albeit in flashback) dragons and trolls. The possibility that it was a magic lump of rock, just never enters her head.

Now, dilithium crystals, that make warp drives work by regulating the matter/antimatter reaction (see Star Trek), are definitely not magic lumps of rock! -Ahem-

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