What must happen when a player has blood on his pants at the knee?

When a player has blood on his pants at the knee, it is a safety and health concern that needs to be addressed. The rule focuses on maintaining player safety and ensuring that the game remains hygienic. The presence of blood signifies that the player may have been injured, and allowing them to continue playing with contaminated clothing is not advisable.

Therefore, it is necessary for the player to either clean the blood from the pants or change into a different set of clean pants. This action helps mitigate the risk of exposing other players and officials to potential contaminants, as well as demonstrating proper sportsmanship and adherence to the rules of the game regarding player safety. Addressing the issue promptly is essential, as it ensures that the game can proceed smoothly without compromising the health of any participants.