Somehow I don't think taking deep breaths is going to prevent me from turning into a werewolf. [Isaac said flatly, assuming that was what Stiles meant when he began talking about his heart rate.
He could see the sincerity in Stiles' eyes and Isaac found that a little odd. He couldn't remember a time where somebody had genuinely cared about him, so it was definitely unnerving, especially since he and Stiles weren't exactly close, not to mention the fact that he had tried to kill the other boy during the first time he'd ever transformed into a full blown werewolf.]