This is when Teddy falls asleep and Rikki Tikki is sleeping by his neck and his mom does not like it. The mom said "He may bite the child," the dad comforted her by saying that he was safer with a mongoose than a blood hound.
This is the part in the story where Nag and Rikki Tikki fight in the bathroom. Rikki Tikki had an internal conflict about were the best place to bite him was then attack!! The narrator said "he was battered to and fro as a rat is shaken by a dog -- to and fro on the floor, up and down, and round in great circles: but his eyes were red and he held on as the body cart -whipped over the floor."
This is the part in the story where Nagina is trying to kill the family but Rikki Tikki is trying to stop Nagina. Then Rikki Tikki said "Turn round Nagina, turn and fight!" Later on They start arguing about how Rikki Tikki smashed all of her eggs in the melon bed near the wall, and how Rikki Tikki had the last egg of hers and Nag (Nag died from the past scene). After this they fought and Nagina got her egg and went to her borrow but Rikki Tikki followed her in and killed her and her egg/baby