"You know how to cast a patronus?" Theo seemed dumbfounded. She had conveniently never told this piece of information to the group. Even when Draco and Theo trained her after DA sessions, she kept the secret close to her heart. It felt like something for only the Order to know - a covert mode of communication. She hadn’t wanted it to fall into the wrong hands, no matter how much she had trusted Draco and Theo at the time. 