Final answer:
Referees are responsible for monitoring players positioned behind the Linesman during an end zone face-off in hockey, ensuring rules are followed and safety is maintained.
Step-by-step explanation:
In the process of conducting an end zone face-off in hockey, it is typically the responsibility of the Referees to watch the players who are positioned behind the Linesman conducting the face-off. The Referees must ensure that players are adhering to the rules, maintaining a proper distance from the face-off location, and not engaging in any prohibited activities such as early encroachment into the face-off circle. It is crucial for maintaining fair play and ensuring the safety of all participants during the face-off procedure.