The change is so abrupt - the glimmers of grace, the sudden jaggedness of her movement, and an embrace that is so unlike her memories - that for a moment Narcissa is lost for words or a response. It's only a moment; with her own wand still clasped in one hand, she wraps her arms around Bellatrix in turn and for all else she cannot help the sense of relief that steals her breath.

(She still has one sister - even like this, Bellatrix is still her sister.)