S3, E5: Frustrated in his grass-roots reform efforts, Colvin arms himself with intelligence from Daniels's detail and personally delivers a message to the next level of corner management. McNulty sees Stringer Bell's legitimate business dealings as a sign that he is now unreachable as a drug target. Bubbles shakes the tree for Johnny one more time; Carcetti quietly seeks to fix the program for protecting state's witnesses after another one is killed; Omar struggles with dissention in the ranks; Stringer hard-sells his new business model to an underwhelmed Marlo. Greggs's surveillance gives McNulty reason to smile, and then he takes an interest in politics. Cutty flexes his muscle and continues to slide back into the life; and Avon returns from prison.