There wasn't any mention of him actually erasing himself, just that he was playing dead. And then for the way he was so pleased and surprised by what Oswin had managed, I kinda feel like he wasn't just impressed with what she'd done, but got inspired by it and decided to follow up.
I'm making an inference there, but I don't think it's a big one.
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I'm making an inference there, but I don't think it's a big one.