[Something about the quality of comprehension dawning isn't mere recognition of a nickname he uses on the network and within the Numbered community. It's on a different level, one he's grown accustomed to recognizing in over a year of receiving pulses.]

Yes, that's me. Numbered call me that. I thought that only Numbered used it, though... I thought you were, but you should have said so immediately.

[He assumes that she's seen the Network and therefore his nickname, but just hasn't gotten a chance to introduce herself on it yet.]

You'll get us to open up to you far easier if you just come out and say you're Numbered too, from the get-go.