Serena became aware of the older Slytherin when they spoke in reply to what she had asked. She's heard...things about them. Things about last term. And she's observed them once in a while during lessons. She added an extra foot between them and pretended not to hear. They, after all, had not addressed her by name.

She understood, though. Potions wasn't just about brewing or collecting ingredients. It was about knowing their effects and the ability to identify said effects when they were in play. The latter was an area Serena needed more practice in.

"The boy over there--" she didn't know their name, "was rolling around in laugher. He could have gotten a laughing potion." Just like the Remy girl.