"Yesterday you told me I should be worried about the ISI," Aayan (Suraj Sharma) shouts in the early stages of "About a Boy," as Carrie (Claire Danes) tries to scare him into staying in the safe house. "Now, today, you're telling me I should be worried about the CIA!" "You should be worried," she replies, "about both." True enough: With the same terse, fragmented structure as "Iron in the Fire," tonight's episode of Homeland ably frames its accelerating narrative as a clash between competing intelligence agencies, one that threatens to ensnare unsuspecting innocents. "Lie, manipulate, exploit," Fara (Nazanin Boniadi) comments, glossing the rules of the game. "We're using the enemy's own way to bring him down," Quinn (Rupert Friend) confirms. "That is the job."