Louisa started changing her position, not believing in all those Yoga stuff becasue she was not relaxed or rest in any way. In fact, she was starting to feel sore like she did first lesson last term. When the position was right, she refused to put her hands on her knees like the professor because she needed them to raise her hand first and then answer the question, "Werewolves are dark creatures, professor." As for the why... Louisa was tempted to say DUHH. But she tried to rationalize, "Because it's in their nature to harm people, animals, things...? They can't control that bad side of themselves?" No idea.