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: Is it to get information out of their prisoners? If that's the case, I could
: see them keeping Keyes and Johnson alive, but not the average Private.
: Is it for a future prisoner exchange? That seems to fall into a traditional
: war mindset that I don't think the Covenant abide by.
: Is it just to create more varied gameplay for us? Is there a real answer in
: the EU?
Don't forget that they were also needed to interface with Forerunner artifacts. The Covenant have known for the duration of the war that humans had the magic touch, so that may have been the biggest part of it. As well as the location of Earth, circa Halo 1.