The sound of the bathroom door opening woke Hermione up out of the sleep she'd fallen in accidentally. Evidently the pain potion was stronger than she expected. Taking an entire vial was likely too much. Based on how cool the water in the tub had gotten, she'd been asleep for awhile. Expecting, and perhaps hoping, to see her husband enter the room, she was startled to see Aubin Dolohov enter the room instead.