How does Rikki Rikki protect Teddy's father from nag?

In "Rikki-Tikki-Tavi," Rikki-Tikki protects Teddy's father from Nag by bravely confronting the snake in their home. When Nag attempts to attack while Teddy's father is unaware, Rikki swiftly intervenes, engaging Nag in a fierce battle. Rikki's quick thinking and agility ultimately lead to Nag's defeat, ensuring the safety of Teddy and his family. This act of bravery solidifies Rikki's role as the family's protector.