Naruto: Shippuden Episode 6

The episode alternates between the relative calm in Konoha and the intense life-or-death struggle in Sunagakure:

While the village is saved, Gaara is left physically exhausted. Deidara reveals his true plan: when Gaara earlier crushed Deidara's arm with sand, Deidara secretly mixed explosive clay into Gaara's own defensive sand shell.

Deidara detonates the hidden clay "ants" inside Gaara's protective sand sphere. The explosion knocks Gaara unconscious, allowing Deidara to successfully capture the Kazekage.