I think I've got the same issue mentioned a long time ago on itch by GreenOnion (comments):
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I uploaded my save on the day before I met Nersmias:
- You can optionally go rescue the shapeshifter first thing, rest and then discuss with Nersmias
- I did try directly choosing "I'm worried about Sillan" > automatically starts the battle, or first taking extra option + "I want to hear about your reason" then "I'm worried about Sillan"
- In both cases Nersmias' conviction depleted (-11 and -7 I think), being once > 30 trust, using often hypnosis, and the second time > 70 trust, never used hypnosis
- When Nersmias' conviction was in negative, I would have prefered some automatic transition to "automatic ending" instead of having to choose between taking an action that will causes Nersmias' convition to increase as I didn't have much choices left, or... trying to leave, after all... it takes a LOT of time to get there, and it's impossible to save whenever we want (this is really a huge drawback to the game)
- Both times ended in the ending C, when the PC is being hypotized before talking to Sillan
I did not use console to alter anything, started this save on easy to see the difficulty difference.