Maybe it would. She couldn't ignore the dreams she'd had since that horrible day twenty years earlier when she was stuck in the flames. Sometimes she could swear that she still felt the flames licking around her, desperate to catch onto her clothing. Was it any wonder that she'd been so anxious to learn how to control it? In her own way, she felt like she was safer if she could conjure it herself. But, at the very least, it offered her an opportunity to make the attack on Ron's house that much more believable and frightening. Who would dare to use Fiendfyre in a simulated attack? No one would believe it was all an act. Ron might even believe that it was real. She needed to count on his appropriate reaction. It would only last for a short time. Just long enough for the nearest neighbors to see the flames and come running. She'd banish it long before anyone was in any mortal danger.