Hermione watched as Ron fought off the demon but did not once stop looking around to make sure they were safe. Her heart was racing but she wouldn't lose her nerve. She liked to think she had been in worse situations, given the Death Eaters she has had to face in the past, even if she had also had that awful experience with a demon.
Ron was by her side soon and she let him question the demon. But then he was nodding at her and she knew straight away what it was he wanted her to do. They didn't really have time to question the demon before them, for all they knew the longer they stood there the closer other demons could be.
"Petrificus Totalus," she said quickly, watching as the demon fell before grabbing Ron's arm and tugging. "Come on. Quickly."