Just a thought: At least part of my reason for thinking that something bad might've happened to Teir is that he isn't there and Ember is clearly still in a bad state, if he was present surely he'd want to be at her side as well!? They are, after all, recognized. Maybe the reason he isn't there is that he simply hasn't been rescued yet. I'd imagine that they split up, so some went to rescue Ember (Cutter and Leetah, and some others) while some went to rescue Teir and the others (Windkin I'd imagine; if Teir is his brother...) Also Ember told Sunstream "No magic rescues, unless I'm a dying Ember." Clearly they've rescued her, so either they decided that "That's it! She's a dying Ember now!" or they - more sneakily went "It isn't a magic rescue if we just get dropped off in the area and do the main part of the rescuing on our own!"