Final answer:
While the information provided discusses the physics of baseball and the force interaction between a bat and ball, it does not directly address the strategic movement of fielders in response to a left-handed batter in Rounders.
Step-by-step explanation:
The subject of the question relates to the strategic placement of fielders in Rounders when facing a left-handed batter. However, the provided information mainly discusses the physics involved in the interaction between a bat and a ball, specifically referring to the force exerted by Mariano Rivera's pitches in baseball, which commonly resulted in broken bats.
This ties into Newton's third law of motion that states every action has an equal and opposite reaction, confirming that when a ball exerts a force on the bat, the bat exerts an equally strong but opposite force on the ball. The important aspect of the question which is the strategic movement of fielders, however, is not addressed in the provided information.