Look at your eggs in the melon bed near the wall. Go and look, Nagiana.
Rikki realizes they were going to kill the family. So, Rikki goes to Nag. He fights Nag and Nag ends up dieing. But he still has to worry about Nagiana.
Nagiana, wanting revenge for the death of Nag, tries to harm Teddy. But, luckily, Rikki knew that Nagiana would want to seek revenge. So he kills all of her eggs, with the baby cobras inside of them, except for one.
Rikki pronounces Nagiana dead after entering her den and fighting her to the death. After this, Rikki is seen as a hero and sort of becomes the protector of the garden, and becomes more confident.