Hermione was on her way to the library for another less than fruitful (she was sure) day evening researching. She'd stay until time for dinner, and then she'd head back to the Tower after dinner and work again on translating the book Dumbledore had given her.
She honestly wasn't paying any attention to the students she walked past in the hallway, and she certainly didn't notice Lisa Turpin there - until she was turning on her.
"What?" She said, suddenly defensive but it could hardly be held against her. "What did I do?"