"I thought so, but... it might become inevitable." He couldn't believe that they were considering a marriage, and James refused to hide that. "I'll make sure he's here with me next time."
He looked at the man. "I have no idea what you're talking about. I hope you know that. You need to give a lot more explanation that you currently do, because these things might have been obvious when you were young, but I've never heard of combat potions. However, I'm good at Quidditch and catching and passing quaffles while flying and having bludgers sent my way. Tell me what to do and I'll learn," he said.
When he saw the hex, he had the dual feelings that seemed to be common around Snape. Anger at not having shown before, because this would have saved hours of migraines and awe at the man's knowledge. "You created it in school? That's wicked." He looked up at the man. "You really needed to get laid more if that's what you did in between classes."
He paid little attention to what he was saying as he thought about the spells. "Umbrus." He repeated the hand movement, and the image was pretty good, although he knew that he'd have to try that at home. "Sectumsempra." When he looked back, the cuts were minimal, but the signs were there. He looked up at Snape, confused. "I know I put power behind it, so why doesn't it work?"