At the door to the Chamber, Hermione pulled her wand, holding it with a tight grip in her right hand as she yanked a dagger out of its sheath with her left. With a fortifying breath, she nudged the door open, the sounds of a fight clearly audible now. Several things fought for her attention. The large room reeked of smoke and spent magic and there was a fire going in the corner near the Chamber's double doors. A body burning, from the look and smell of it. She couldn't tell if it was a man or a woman, couldn't see Draco at all, and that jolt of panic turned into a veritable river. The fight closest to her caught her attention, and she didn't hesitate. Casting the strongest nonverbal Disillusionment Charm that she could, she approached from Sybille's back. The woman was a force of nature, barely held of by Theo and Ron. She ducked and she wove, avoiding the curses Sybille parried or deflected as she closed in. She hoped everyone was too engaged in their current battle to notice the subtle ripples as she moved through the room. Muffling herself with another nonverbal spell, Hermione stowed her wand in a pocket, adjusted her grip on the dagger in her left had and yanked a wickedly sharp long knife from the sheath across her chest with the right. Silently, she maneuvered until she was within reach of the Commander, movements like flowing water. Quickly, without hesitation, as she had been taught, she shoved the dagger into the small of Sybille's back, just over her left kidney. She felt the resistance, then the give. Heard the faint pop of skin tearing open, heard Sybille's surprised exhalation, felt her jerk and try to turn before Hermione reached up and around, dragging the serrated edge of the knife across the woman's throat.