Regulus shook his head. "No, nothing in particular. I thought it was polite to greet you since we've had lunch together for days. It is what people do."
Really if he didn't know better, he'd think that Albus was slow, but he had seen what he could do. "So why exactly do you stutter? From your reaction, you don't think you're doing it on purpose and by the way, what kind of slytherin makes his emotions this obvious? But it's not physiological either, because if it was, someone else's memories wouldn't have changed anything. Remus might think he was your grandfather, but that didn't mean that he stopped being a werewolf just like Severus didn't turn into one. So you can clearly speak just fine, so why don't you?" he said, very calmly and very curious.