Having been raised by Muggles Hermione thought she knew exactly how dangerous it could be, but she didn't say a word despite her fear at the thought of creeping through a facility filled with armed soldiers. Besides, she rationalised to herself, her fear was probably just old ingrained irrational fear lingering from before she'd known about magic, because magic had to trump guns – purely defensively, there were shields and the disillusionment charm, amongst others. It would be fine. Or so she hoped, at any rate.