Well, whoever wrote it has watched S1 one of Torchwood (at least the first episode), since there are certain elements from the show (the immortality, the invisible lift), but it was obviously written before S3 of DW aired, because it doesn't follow what Jack tells the Doctor in 'Utopia'. So... AU, but with a Torchwood-y flavour, definitely. (I can't explain how frustrating it was to watch S1 of Torchwood, not knowing why or how Jack had ended up where he was, and with only minimal clues. This fic is an excellent fill-in-the-blanks!)
Oh, and you should watch Torchwood, for it is fabulous!
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Well, whoever wrote it has watched S1 one of Torchwood (at least the first episode), since there are certain elements from the show (the immortality, the invisible lift), but it was obviously written before S3 of DW aired, because it doesn't follow what Jack tells the Doctor in 'Utopia'. So... AU, but with a Torchwood-y flavour, definitely. (I can't explain how frustrating it was to watch S1 of Torchwood, not knowing why or how Jack had ended up where he was, and with only minimal clues. This fic is an excellent fill-in-the-blanks!)
Oh, and you should watch Torchwood, for it is fabulous!