That's be inconsistent with what's been shown so far. Surprise traumas don't make sense.

I find Emilia's response funny, though. She says she wants to return the favor to Subaru (and cut of their relationship), but she can never do that. Doing so requires for her to die a few times for his sake, something only he, ironically, can do. I wonder how these girls would feel after learning just how hard and how much pain Subaru had to go through for their sakes?