What action should be taken if a bowl from rink 5 is heading towards a bowl on rink 4?

The appropriate action in this situation is to stop the bowl that is heading towards a bowl on a different rink and have it replayed. This is necessary because bowls are only intended to interact within their designated rinks. When a bowl from one rink crosses over and jeopardizes the game on another rink, it can disrupt play and lead to potential confusion or incorrect scoring.

By stopping the bowl, the umpire upholds the integrity of the game, ensuring that all bowls are played and counted within their respective boundaries. This action maintains order and fairness in the match, as every player deserves to have their bowls played without interference from bowls from an adjacent rink. Hence, replaying the bowl eliminates the possibility of unfair advantage or confusion that might arise if the bowl were allowed to collide with another.