"It wasn't your fault," he said.  For some reason, she seemed to find that funny, and she began to giggle.  The laugh grew until she was gasping and if he hadn't spent far too much time around Zabini and Goyle and their post-war attempt to categorize the effects of as many drugs as possible "for research" he'd have assumed she'd lost her mind.   As it was he just sighed and waited for the moment to pass.  