When a loud 'boom' rocked the very floor Hermione was standing on, she didn't have any time to think as she fell to the floor and another shudder ran across the ground, spilling ledgers and files, papers and one of the filing cabinets to the floor and across her leg. The only coherent thought she managed to pull together was to thank Merlin that the piece of furniture was the S-Z one she hadn't quite gotten to organizing.
Attempting to tug her leg free, she heard a loud groan and crash from outside the door to her department. It sounded suspiciously like something fell in to block the door. Praying that wasn't the case, she swiped away blood that had begun to trickle down her temple, and screamed, "Help!" as loud as she could. Then patted down her pockets for her wand.