Just outside of Winnipeg, the bison play all kinds of sports on the prairie fields. But one day, Sheriff Buffy decides to take over all the fields so that the bison can only play hoofball! She tells Emma, a young hoofball player, that hoofball players are superior to all the other players. First, Sherriff Buffy goes after the field hockey players and takes over their fields. Emma and the other bison are too scared to speak up. Then Sherriff Buffy goes after the lacrosse players, and then the soccer players. Will Emma or any of the bison muster the courage to speak up before she comes for them?