"I had a feeling everything’s going to take a turn when Nott disappeared," he continued after sitting back down with a drink in his hand. "You know that whole story." Hermione nodded. "Basically, Pansy got trapped and when I got her out, I didn’t know where to take her, so I thought Hogwarts was the best place. Fortunately, you found her, and everything went as planned. But it didn’t end there. I knew Voldemort wouldn’t calm down until he found Pansy and saw either her dead body or had a chance to kill her himself which he loves to do to those who betray him." He sipped the drink. "I have been anticipating something like that to happen for a few months now, so I started to experiment in the lab to make something similar to Polyjuice potion but with much longer-lasting effects. After lots of trial and error, I finally managed to concoct something that has an effect lasting for more than a week."