Cordelia kept silent, true to her word, and began working on her potions work. She thought a notice would have solved a lot of problems if Tristan was going to be so grumpy about another student showing up to work. It wasn't as if there were many other places that were good for the more practical side of potions homework. It was like expecting someone to work on herbology anywhere but the greenhouse. Not entirely impossible, but best to work in a place designed for that sort of work.