Idea 1 - As you kill people, you gain their points, for each hit you gain points based on damage dealt and distance for bow shots. Winner is the person with the most points after 1 minute.
Idea 2 - Center monument with a cake at the top, winner is the one who eats the most cake?
Idea 3 - As you kill people, you give them your points, for each hit, the person hit gains points based on damage and distance, person with the most points gets decapitated during an end game show? Winner is the person with the least points.