This triggers the episode’s central conflict. Diaz wants to break the rules. He suggests "tactical waiting"—following Webb until he makes a mistake. Harmon, the 20-year veteran, refuses. She recites the mantra: "We enforce the law, we don't fix it."
The frustration is palpable. You can feel Diaz’s knuckles turning white on the steering wheel. The episode’s most innovative sequence happens at the 22-minute mark. We cut to the footage from their body cameras, but the audio is muffled by traffic. The visual is shaky. When Diaz confronts Webb behind a convenience store, Webb shoves a civilian into Diaz. On camera, it looks like Diaz lost control. Off camera? Webb whispers: "I’ll see your girlfriend tonight, pretty boy." on call s01e06 mpc
The call comes in: a noise complaint at a known flop house. What should be a routine "check the perimeter" turns into a rabbit hole. The suspect? Marcus Webb (guest star Amaury Nolasco, playing against type as a greasy, untouchable predator), a man with three prior arrests for assault, two restraining orders, and a lawyer on speed dial. The genius of "MPC" is that it doesn't paint Marcus as a cartoon villain. He’s smug. He knows the penal code better than Diaz does. When Harmon and Diaz arrive, he’s standing on his porch, phone in hand, recording them. This triggers the episode’s central conflict
"He hurt a child, Harmon. He threatened my family. The camera didn't hear it. You did." Harmon, the 20-year veteran, refuses
What did you think of Diaz’s choice? Should Harmon have stopped him? Drop your thoughts in the comments below.
When Internal Affairs reviews the clip, Diaz is threatened with suspension. Harmon is reprimanded for "escalating tone." Webb walks. Here is where On Call earns its R-rating and its complexity. As they drive Webb back to the precinct for processing on a different charge (loitering, a slap on the wrist), Diaz locks the car doors.
The episode title, "MPC," stands for —but ironically, it’s an episode about everything the camera doesn’t see. The Cold Open: A Shift in Atmosphere Unlike previous episodes that drop us straight into a 911 dispatch, "MPC" opens with an eerie quiet. Harmon is staring at her reflection in the squad car window. Diaz is scrolling through a victim’s social media—a teenage girl who was assaulted last week, whose case was dropped due to "insufficient evidence" (a direct callback to Episode 4).
