Delahunt: Of course I know how to spot a cop.
Fitzy: How's that?
Delahunt: If he's not paying attention to us, he's a cop. Lookit, you see that guy over there?
Delahunt: Right over there.
Delahunt: Not paying attention to us. He's a cop.
Fitzy and Delahunt are joking around about how they know how to spot an undercove cop.