What should be done if A-1 is fouled and there is blood on their jersey during the game?

When A-1 is fouled and there is blood on their jersey during the game, the player should leave the game until the situation is resolved. It is important to prioritize the health and safety of all players. Blood on a player's uniform indicates a potential injury, and the rules dictate that the player must be checked and possibly cleaned up before returning to the game. This measure helps to prevent the spread of bloodborne pathogens and maintains the integrity of the game.

In this context, allowing the player to continue playing without addressing the blood or merely cleaning the jersey does not fully address health concerns. Additionally, issuing a warning to the team does not solve the immediate issue and is not a standard protocol in this situation. Thus, ensuring that A-1 leaves the game for necessary attention is the appropriate and required course of action.