Booker knows exactly what she's talking about, he's seen it all and more. She's heard Comstock's plans, but she doesn't know exactly how far the bastard went, finding some kind somewhere to pass off as his own. No, she hasn't heard that part yet and he's still not sure he should be telling her about it. He hasn't. And he doesn't want to. Who does that to a kid?

"You open your mouth and talk about it, Elizabeth." Delsin might as well not be there anymore for all the attention Booker plays him. "Hey, I met someone today, Booker, maybe you ought to meet him. That easy. Hell, you've never been shy about telling me things before, why the hell start now?"