[ When he sits up, Sasha places her hand on his shoulder. She shakes her head. ]
I do not know -- not in the sense on how things work in your world. There are too many possibilities, in which you can think that you were part of a war, a most terrible accident, or -- [ She pauses, hesitant to voice that last thought. ] that someone or something is after you, and making you forget is a means of protecting you.
You may have lost your memories, but how you feel about what little you can remember tell you that what you do not know now is important to you, regardless if it is frightening or that it might bring you pain.
[ If she had the say, then she would protect Touma in any way she can and try to find a way to convince him not to push through if it were dangerous. But his memories have been, in her observation, a nagging bone of contention. He can be "fine", living without them; but as one who bears importance to memories, not seeking a way to recover lost ones is not something Sasha wishes to encourage. ]