[He half-smiles.] I couldn't leave you--her--without a companion. [It's in the motion of her hands dropping that he catches sight of a sparkle on her hand and discreetly peers at her hand. It looks like she's already got a companion of her own.]

Hm? Oh, no, I can't do that at all. I can only look but not touch. Bit like window shopping but minus the windows. And the shopping. [This...is a bit of a lie, but considering who she is, he reckons learning that he can suppress and block memories is not something she will appreciate learning about him.] I can share them as well! Well, that works better between other Time Lords; our minds are able to handle the shift in sense memories. Like if you ever want to see what you were like as a facsimile of me, I'd be more than happy to show you. But no, I couldn't have "changed" you back to how you were in your mind. The memories that make up who you are were hardly there. It'd be like if I tried to play alchemy but with your mind, making something wonderful from something basic and rudimentary and completely defying the laws of physics and chemistry as we know it.

[Or rather, how he knows it. He knows the detective is intelligent, but just not nearly as much as him.]