As much as possible, referees in sport should be neutral. However, there are certain situations that make this neutrality difficult, especially when they are in the middle of the action.
In hockey, this occurs when the puck hits the official. The rule states that the referee is part of the game and should not, under any circumstances, try to fix his or her mistake. It seems that Corey Syvret forgot this rule, as you will see below:
It's a good thing that the pass didn't lead to a goal for Boston. Looking at the official's face after the play, we can well understand that he knows his mistake. The story doesn't say if he was punished by the league for this lack of judgment... On their side, the Senators fans don't seem to have digested it yet.