premise: The umpire and others look on, as one baseball player slides into base and the other leaps high in the air. hypothesis: The umpire watches as the inning ends and the players return to the dugout.
contradiction: When the inning ends and the players return to the dugout, the game is over.  But if one baseball player slides into base and the other leaps high in the air, it's in the middle of the game.