What ruling applies when a player removes his helmet after being called out sliding into second base?

The correct ruling in this scenario is that the player shall be penalized if a warning was given. When a player removes their helmet after being called out—such as in the situation where they are sliding into second base—they must adhere to the rules of the game regarding helmet removal. If a prior warning has been issued concerning this behavior, the player is subject to a penalty as part of maintaining the discipline and safety standards in the game.

This ruling emphasizes the enforcement of rules designed to promote player safety and sportsmanship. If a player disregards a warning by removing their helmet despite knowing the consequence, it reflects a lack of adherence to the game's conduct guidelines. As a result, imposing a penalty helps reinforce the importance of following the established rules.