To make sure the rules are upheld throughout the game there are two umpires in place during games. Umpires are responsible for making decisions and notifying the scorers of these decisions. Two umpires are in place on the playing field while there may also be a third umpire off the field who is in charge of video (if any) decisions. This happens when the call is too close for the on-field umpires and they refer it to the third umpire who reviews slow motion video replays to make a decision.