What happens
Coriolanus enters Rome triumphant, but the tribunes and senators immediately confront him over past statements against the people. When Brutus accuses him of seeking tyranny, Coriolanus explodes in rage, denouncing both the tribunes and the commons. His uncontrolled anger—calling the people cowards and despising democracy itself—gives the tribunes exactly what they need: evidence of sedition. They arrest him for treason, and though his supporters fight back, the mob demands his death. Menenius urges calm negotiation, but the damage is done.
Why it matters
This scene is the play's turning point. Coriolanus has just won the consulship through performance—barely—but the moment he stops performing, he reverts to his true self: contempt for the commons and disdain for democratic process. The tribunes bait him with the word 'traitor,' and he cannot resist. His outburst is not calculated; it is genuine rage at being forced to speak fair to people he despises. This is the tragic flaw made visible: his absolute integrity becomes his absolute liability. He cannot lie, cannot bend, cannot play the game that politics requires, and in his refusal he destroys not only himself but risks Rome itself.
The scene also exposes the fragility of Rome's political structure. Both Coriolanus and the tribunes are partly right and partly wrong: Coriolanus is right that the people are fickle and easily swayed, but he is catastrophically wrong to say so aloud and to refuse them even the courtesy of respect. The tribunes are right to fear his contempt for democracy, but they are wrong to manipulate the mob rather than reason with it. By the scene's end, the tribunes have orchestrated a riot and Coriolanus stands accused of treason—yet the real tragedy is that neither side has behaved well, and Rome's city is 'torn' precisely as Coriolanus said it would be. His banishment becomes inevitable, and with it, the play's descent into chaos.