Blocking the ball from reaching the end of the hall, and defending oneself against the ball which is travelling at a high velocity directly towards every part of your body at once, which is explainable by taking into account the calculations for the de Broglie wavelength. According to Quantum Mechanics, all moving objects are waves, and therefore their location and exact destination cannot be determined - only the range of possibilities based on the calculated de Broglie wavelength. Therefore, it is not impossible that the ball is traveling directly towards each part of the body at the same time, given a high enough speed on the order of 100,000,000 meters per second (approaching the speed of light) - which may be well below the actual speed of the ball in this game. Now the math for this is shown as Blah Blah Blah Blah Blah....(you wouldn't read it anyway)