Who stopped mars bar from fighting maniac Magee?

This sounds like a reference to a fictional story or a joke. Could you please provide more context?

* What is the source of this question? Is it a book, movie, comic, or something else?

* Who are Mars Bar and Maniac Magee? Are these characters from a specific story or just made up?

With more information, I can help you figure out who stopped them from fighting!