revial: There's a father who's concerned, because his son has accepted to duel a man known as a butcher.

You help him, he helps you gain access to these rebel scum's hideout. Viola, you find Traut.

As the father and son event is unavoidable if you go in the general direction of the inn, I suspect you have not actually passed through the whole map. ;p

I suspect, if you had found Odrin, that will eventually lead you to finding Traut as well. Odrin is outside the SW gate, on the beach. And, considering how damn annoying it is to listen to the soldiers yell "Odrin!" constantly, that's probably the first thing many people do when they start the Act and reach the camp. :p

halilibrhm: i already finished them? actually at the very beginning of that chapter both of them talked with me but i didn't get a hideout. there isn't a single location i didn't try beside mist obstacles :s

revial: At the end of helping the father out, he gave you a square coin and some advice on a certain whore, which will lead you to the man you're looking for. Unless you didn't ask him for anything? I dunno, but I suppose it's possible you could have not asked for anything in return.

Finding Odrin should have also given you the option to get a square coin and advice about a certain whore.