Here Rikki Tikki fights a snake, Karait, and bits him on the back which peralizes him, the od man then comes with a stick to wack it to death.
In the scene Rikki Tikki over hears Nag and his wife discuss how to kill the old man and his wife, while Nag sleeps Rikki Tikki jumps on the snake and grabs him by the head and makes sure not to let go. He gets filng around until the old man comes in with a gun and shoots the snake.
In the story Rikky Tikki has to struggle and fight with Nagaina before she gets in her hole, for he knows he cannot win. SO he struglles and grabs a whole of her tail and tries to drag her out.