Hm. I wonder if the spirit knows any magic? I know he's not a woman, so he it would be somewhat unusual for him to know magic, but it's not like it's impossible, since Odin is a thing. Actually, he does know seidr - he taught us the healing palm spell. I'd rather try to learn from him than the witch - from what we've seen of her so far, she can't be trusted at all.
Can't really follow up on that line of thought, though, since we can't even communicate with the old man right now. I don't trust the witch to help us with that, either, since the old man is clearly trying to stop her from doing something to us, and if we're able to head the old man it'd be much harder for her to do whatever she wants to do.