English is not my native language either and your english is fine.
It did cross my mind that the teacher is being held captive, I just really like the betrayer teacher theory better because of the personal impact that it has on the Herbalist. And generally speaking I simply take everything the Nameless says as a half-truth since I don't think he's lying because he has no reason to but, he's also not telling the truth since he always keeps his answers open ended and ends all conversation whenever we try to get rid of ambiguity, but since he is one of the only sources of information that we get about big events in world I tend to take what he says in consideration, maybe the teacher is not even in the orc camp and is farther north.
And it is mad sus how he can just just tank a love potion like that and remember, like what are your endurance and intelligence stats like, sir?