last paragraph in Nil Desperandum ch titled Never Say Die:
The hall was in uproar as Professor Trelawney leapt to her feet, crying of terrible things and made a lolloping run for the door before anything worse could happen to her. Hope grabbed her wand and muttered a quick spell under her breath. She'd once learnt it from one of Dad's books and had used it every now and then to torment her brother. A dark puff of cloud broke away from the enchanted ceiling and drifted after the Divination teacher, beginning a light drizzle of rain on top of her as they passed into the corridor beyond.
I was going to let imogen know!
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