[SPOILER] Plot Discussion Thread *Spoiler Alert*

[Fortigurn]

Words "gangrene" and "foot" never mentioned in the game's language file regarding to Mandus (as if he had/experienced it). Nor in any documents. Nor in notes.

Here are the words spoken by the Machine; 'Did it hurt to carve out the fevered flesh? Did it hurt to cut free the gangrenous foot?'. Are you saying these words appear nowhere in the game at all?

The Machine talks about something that may or may not happened or was experienced by the Mandus in the past...

But it does so in such a way as gives us no reason to doubt that it did happen, and that it was experienced by Mandus. Attempting to explain this away necessitates a string of unsubstantiated assumptions, as you've acknowledged.