The halo rule, also known as the “Buster Posey rule,” is a regulation in Major League Baseball (MLB) that is designed to protect catchers from collisions at home plate. The rule was implemented in 2014 and is named after San Francisco Giants catcher Buster Posey, who suffered a season-ending injury in 2011 after being hit during a collision at home plate.
Under the halo rule, a runner attempting to score at home plate is not allowed to initiate contact with the catcher, and the catcher is not allowed to block the path of the runner without possession of the ball. If a runner does initiate contact with the catcher, they will be called out, and if the catcher blocks the path of the runner without possession of the ball, the runner will be awarded home plate.
The rule is designed to reduce the risk of injury to catchers, who are particularly vulnerable to collisions at home plate. While the rule has been controversial in some circles, with some arguing that it takes away from the physicality of the game, it has generally been well-received and has led to a reduction in the number of serious injuries suffered by catchers.
Overall, the halo rule is an important part of modern baseball and is designed to protect the safety of players on the field. While it has faced some criticism and debate, it has generally been viewed as a positive development for the sport.