Childermass doesn't particularly care that they're mad at him. He's got her here, hasn't he? Now the ball is in Norrell's court, as it were. Whether she actually receives compensation for this. Whether he actually gets a drink for her. Whether they keep her here and make her talk. He will leave it up to the Great Mr Norrell himself to decide her fate. He's done his part, for better or worse.

"I did not lie to you, sir," Childermass retorts. "I have seen her with the boys on multiple occasions. She knows them. I merely brought her here in the easiest way I knew how." She's a prostitute, Norrell. You're an intelligent man. Put the pieces together, he doesn't think he needs to spell it out for you.

He doesn't really pay Nancy any mind. She isn't exactly a threat to him. He does feel for her, in some way. But if she cooperates then she doesn't have anything to worry about. So if she knows anything about what's good for her, she will. Though Childermass has a feeling that she'll do anything but.