J.K Rowling is the most creative and most imaginative book writer in the whole world! Think about it. She had to think about every tiny thing in the castle, tables, cups, and even specks of dust to write the book. Professor Snape was a perfect actor for the character that J.K Rowling was imagining in her head. I would never have thought that professor squirrel would have been voldemort I thought Snape was. Snape loved Harry's mother so he couldn't be voldemort who killed his mother..... You see in the last movie.