[X] Tell Halfdan we have something important to talk to him about privately that won't really wait, and proceed with the conversation as planned (including all privacy measures), sounding him out about what happened with the Hading Witch and (more importantly, but related) his current situation with regards to being connected with Dorri. Assuming he has no existing oaths of loyalty or similar things with Dorri, tell him the truth about that situation (likely via Eyespeech), as was already the plan. If he does have existing oaths to Dorri, our response depends on what those oaths are.
-[X] Use our Social Tricks to make sure Halfdan is telling the truth and help figure out his opinion. Spend 5 Odr on the needed social roll.