In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: The movie begins with a scooter chase between Harry and his nan because she didn't know it was him. Afterwards, Harry is sent to get a chicken for lunch, but they fire a machine gun at him and throw a grenade, which Harry throws into the chicken shed, blowing them up. Nan tells Harry the story of his twin brother, Otto, which Harry claims to have heard before. 
Suddenly, Harry and Nan then discover that their beloved pet hamster Abu is ill after he vomits a green substance on them, so they take him to the vet. He is almost put down until Harry takes him back home. Ed the vet and his assistant, Kisko, are working for Harry's neo-Nazi twin brother Otto who was abandoned by Nan in the 1970s, claiming it was because she couldn't look after them both, and was raised by Alsatians.
After another failed attempt to capture Abu (by disguising as a priest and a nun), Harry and Nan decide to take him on a trip in their Rover P6 to Blackpool for a week before he dies (when Abu really wanted to visit the home of Rihanna). Ed and his assistant pursue them on the road, until they arrive in "Blackpole" by mistake. The next day, Harry and Nan take Abu on a personal guided tour around the nuclear power plant by the cleaner. Ed and Kisko attempt to capture him again only for him to end up turned into a destructive giant caused by radiation which wears off shortly. While walking on the beach they encounter Barney Cull, a member of the Shell People.
Who prevents Abu from being put down?