Pity that the average Knight has no idea WHAT the plans or relations are in that area.
Jens assumed that Barca wouldn't mind, since Evansburg was just "taken" by Aurendil, if he slipped through and messed around a bit. Never heard of a treaty about it. Not that he cares, of course.
furthermore, if you're aiding our arch enemy, you kind of have to think we'll consider you to be one, too, don't you? lucky I didn't stab you