"I. Right. Yeah, I think I was just getting caught into thinking too much," Seamus told him, smiling and giving a soft chuckle. "So what are we doing? We need to go somewhere that no one knows us. Maybe we'll run into some birds that won't turn us away for being 'Dean and Seamus from school,'".
Dean was Seamus's best friend. There was no reason for him to look into it too much, even if his brain was still playing the "what if" game.