Task: Question Answering
Input (English): Passage: Anna, a soon-to-be secondary school graduate, plans to go traveling for a year before attending university, much to the displeasure of her father Tony. Her friends are dealing with their own issues: her best friend John is secretly in love with her, Chris is struggling with a class assignment, and Steph is trying to get her social justice reporting past the tyrannical vice principal Mr. Savage ("Break Away"). Nick, Anna's macho ex-boyfriend, is also making her life difficult ("Hollywood Ending"). The night of the school Christmas show, in which Chris's girlfriend Lisa is performing ("It's That Time of Year"), Anna and John are working in the local bowling alley and Chris and Steph have gone to film for Steph's story. During this time, a zombie infection starts spreading and Lisa, Tony, Savage, and Chris's grandmother are stranded in the school. Anna and John bond over her post-graduation plans on their ways home from work.
The next morning, Anna and John leave for the school, completely oblivious to the zombie chaos around them ("Turning My Life Around"). When they encounter a zombie dressed as a snowman, Anna decapitates him with a seesaw. Figuring it will be too dangerous to go home or to the school, they go to the bowling alley where they meet Steph and Chris, who had taken shelter there. Steph finds out that an army evacuation is coming to the school, so the group plans to go there once it is safe. Anna and Steph find the zombified cleaner and Steph kills her, alerting a group of zombified bowlers to break in. The group kills them all after a bloody fight and realise that getting to their loved ones will be difficult ("Human Voice"). 
Question: What are the names of the group of people that kills the zombified bowlers that break into the bowling ally?
Output (English): Steph.