She 'd broken his neck , but that was before she knew he was her brother . It made her wonder when her expiration date was . They 'd been created around the same time after all . Speeding up , Max decided a super - charged flight would help clear her head , and soon she was pushing her top speed .
Why did she break his neck ?
- Because he was her brother .
 - None of the above choices .
 - Because she wanted to kill him .
 - Because she knew he was her brother .


Because she wanted to kill him .