Harry read the journal as she wrote in it. Make a way, she said. He wracked his brain for something she would know but that some random Death Eater probably wouldn't. "All right. Second year, which would be your first year, I overheard Ernie MacMillan telling Hannah Abbott that I was a dark wizard because I could speak Parseltongue, and tried to confront him about it. Pretty sure most of Hufflepuff would have heard about that."
He moved cautiously closer and sat down across from her, but not too close. "Do you want me to fix that for you?" he asked, waiting for her to answer before taking out his wand. He didn't believe it would be all that common for Death Eaters to start polyjuicing themselves as random students, though he could admit it would make more sense for them to do it to him personally.