I think the reasoning behind it that the betrayal is too much. I might revisit this path in the future to allow him to release Vess at a later time.
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That'd be even better, I was thinking about the simplest option.
Btw., after this experience I tried playing a darker version of Camran (actually, a real d**k). It feels strange, like he's switching personalities. Apparently the story is intending him to be at least reasonably nice, despite offering all those unfriendly choices.