Finch: I'm not all that comfortable with your arrangement with Detective Fusco.
Reese: He's an asset.
Finch: He's a corrupt police officer who tried to murder you.
Reese: He's not the first person who tried to kill me. Fusco will stay in line.
Finch: Your detective is a nice pet to keep, Mr. Reese, but sooner or later... he'll bite you back.