Well I can't speak to other rinks or other levels of hockey but our main job is to just be a second set of eyes for the official. An official could be screened from the play by any number of things. At the D3 level there are no cameras on the nets for review. I've been asked by officials a number of times what I have or haven't seen when a coach questions their call. I've also had an official who couldn't get into a great position for the play and he made his initial goal signal off of my light. At the end of the day we are mainly just another tool for the officials incase we are needed. Beyond that, I give the opposing teams information about how long it is before they take the ice, warmups/before each period. Also, i relay other gameday information they may need. if they need some other kind of assistance while off the ice, possible a trainer or something.