Thumb VS thumb

Have you ever seen a thumb fight in the Old West? Now you have! The saloon is invaded by several armed thumbs. You must act to resolve the conflict. You must unsheath the first one to calm them down. Both thumbs are facing each other, with a button between them. You must press the button to score points. But your thumbs cannot be blocked by your opponent's. The first one to reach the required number of points wins the game.