[Her eyes go wide at the sword just cutting right through rock like that -- if she tried that with her rapier, it would definitely scratch and snap!! -- but he's talking again before she can say anything, and she tears her gaze away from the weird blade to focus on him more closely.]

It's not about forgetting... it's about having something that can bring her to mind! Like listening to your favorite song and remembering a happy memory that goes along with it.