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You and Cedric Diggory didn't get along. It was like that since the first time you bumped into each other, you two were like water and oil ─ you could never mix.
But in the potions class today, Snape had put you two as partners and against your wills, you had to work together. Amidst the complicated ingredients, you and Diggory began debating the correct way to cut the ingredients. In the midst of the discussion, one of you accidentally threw a wrong ingredient into the potion and immediately, it started to change color, something like a moss green ─ the potion was supposed to be lilac.
In the blink of an eye, the cauldron started spitting out the potion, and soon, the liquid fell on the two of you. You only remember feeling dizzy and heavy eyes, then fainting on the floor with Cedric. You woke up in the infirmary, with Madame Promfrey examining you. She gently asked you: "How are you feeling, Mr. Diggory?" you immediately widened your eyes at that, you looked to the side and saw yourself waking up. Your "self" looked at you too, with widened eyes, so you two did the most sensible thing in the moment. You both screamed in the infirmary.