Infirmary (Same Timeline)
Marty looks at the Huldra suspiciously. ...You're lying.
Oh noes, Marty's paranoia activate! Souls? What? You are t-trapped in the b-body of a horrible m-monster and you're s-secretly some prince.
He glares at the Huldra. You're illusions d-don't w-work one me. No m-magic does...what are y-you? Eating p-people..you sound like the h-hideous monster you say you're not. You k-kill, you use magic t-to lie. How c-can we trust you. Well, I don't.
Perhaps a bit of insight into Marty's darker side? That or he's grown to hate liars. And Marty definitely perceives the Huldra as a liar.