Got a question on rule clarification, comments on rule enforcements or some memorable NHL stories? Kerry wants to answer your emails at cmonref@tsn.ca. Hi Kerry, With a lot of playoff games this year already going deep into overtime, weve all heard talk about how no player wants to be the one who makes a mistake prompted by exhaustion that leads to the game-winning goal. But to what extent does all this extra play time affect the officials? How much do they feel the physical and mental fatigue caused by a game heading into its second or third overtime period, and is this related to the perception - real or imagined - that officials tend to "swallow their whistles" in OT? Best,Mark Hill Mark: Fatigue was much more of an issue to contend with in the one referee system when we chased the play from end to end and didnt get much of an opportunity for a rest. A refs best friend can be a moving puck. Whenever possible, I attempted to force players to "move it"! Aside from enhancing the entertaining value of the game another upside of sustained action was that players gave and received hits with less likelihood of retaliation and scrums developing. On occasion I wore a heart monitor and during three to five minute runs without a whistle the readings would be sustained between 165-175 bpm. By comparison the highest my heart rate ever got in the two referee system was 98 bpm. There should be no reason (in the two-ref system) where physical fatigue might negatively impact the decision making process for an official regardless how many overtime periods are played. The mental aspect of a referees performance is a whole different kettle of fish! While players dont want to become the "goat" by making a bad play or mistake, the referees internal struggle is all about rendering a decision that might be perceived as a game ending bad call. (You notice I said perceived.) The best remedy in dealing with this pressure is for the official to maintain a rock solid focus of concentration by remaining in the moment and react to call penalties whenever they occur. Once a ref stops refereeing and puts his whistle away he becomes a spectator instead of an enforcer of the playing rules. Each referee can feel intense pressure to make sure any call he makes is viewed as a "must call" in the late stages and overtime. The referees best work is done well in advance of the late stages of a game by maintaining the expected standard of enforcement and to keep the players in check throughout the entire game. The best deterrent against infractions being committed is "fear" a ref can instill in players that he will call the penalty whenever it is committed. When that is achieved players tend to play much more disciplined. The onus is placed more squarely on the players not to commit infractions once the referees enforce the rules more consistently and when expectations are met. I notice a difference in these playoffs as to which referees the players respond to and those they take full liberties with. Once the penalty standard slides and obvious infractions are let go it is extremely difficult for the referee to make a call in the late stages unless it involves a scoring opportunity, a puck over the glass or a major infraction. At times such as this the referee crew become spectators and fly on a wing and a prayer in hopes that the players will not do something really stupid that might force a call. If the referee chooses to turn his whistle into a fossil the worst thing he can do is upset the apple cart with a penalty call that doesnt have a direct bearing on the play or is of less quality than what he previously has let go. We saw a prime example of this with fewer than two minutes remaining in Game 4 of the Habs-Lightning series. While it is difficult to deny that the trip by Cedric Paquette on Michael Bournival was a legitimate foul, given the countless infractions that were not penalized, the referee(s) were subjected to justifiable ridicule for calling a trip in the corner of the rink at that time of the game. It is important to note there have been some real solid performances by the zebras in games thus far. The officials we notice most however are ones that stop refereeing the game and employ a standard of enforcement that resembles shifting sand. This isnt a result of fatigue; physical or mental. There is an answer to this dilemma. The referees have to be given clear direction by the Officiating Management to know and maintain the expected penalty throughout the entire game. In this regard the officials need to be better coached and held accountable when the expected standard is not met. 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The Philadelphia Eagles acquired running back Darren Sproles from the New Orleans Saints for a fifth-round draft pick on Tuesday.SAN SEBASTIAN, Spain -- Robin van Persie missed a penalty as Manchester United was held to a 0-0 draw at Real Sociedad in Group A of the Champions League on Tuesday. Van Persie saw a powerful shot ricochet off the right post in the 65th minute before hitting the same piece of woodwork four minutes later from the penalty spot. A scrappy opening half by both teams gave way to a United-dominated second period, with Javier Hernandez firing high over the bar in the 50th with an empty net beckoning. United midfielder Marouane Fellaini was sent off in the 90th minute after his second yellow card of the match. United remained top of the group with eight points while Sociedad earned its first point of the campaign. Bayer Leverkusen is second with seven points after drawing 0-0 against Shakhtar Donetsk, which has five points. United can clinch its place in the knockout stage with a victory at Leverkusen in its next match, which would keep Sociedad alive only if it wins at Shakhtar. "That was a game we should have won. It was there for us to take the points, get ourselves in a really strong position, and near enough get clear," United manager David Moyes said. "At the moment were still top of the group and in a good position." While Wayne Rooney set up Shinji Kagawa for an early chance, both teams failed to establish any rhythm until the half hour mark, when Imanol Agirretxe sent a good chance wide. Sociedads Carlos Vela and Alberto de la Bella caused troouble for United before the break, but neither side really threatened until Shinji Kagawa slid a pass through the box to Hernandez, who somehow powered the ball over when a gentle touch would have sufficed.dddddddddddd Van Persie, who replaced Rooney, and Ashley Youngs entrances in the 63rd minute turned the game Uniteds way and the pair nearly created a goal from their first touches as Young found the Netherlands striker at the far end of the box, only for Van Persie to rocket an angled shot off the post. Markel Bergara was harshly judged to have tugged Young down inside the area to set up Van Persies spot kick, but again the Dutchman found the right post. "I felt I got a touch on it," Real goalkeeper Claudio Bravo said, "Im just not sure if it was before or after it came off the post." Vela chested Xabi Prietos rising shot just wide as Sociedad finally threatened Uniteds goal in the second period. Haris Seferovic replaced Antoine Griezmann with 10 minutes remaining despite the Frenchman being Sociedads top scoring forward this season, with five goals in his last three games. Antonio Valencia saw a shot cleared off the line after Griezmanns exit as Sociedad held on to avoid a club record fourth straight European loss. "I thought we started the game better but as they found space they started to take over," Real coach Jagoba Arrasate said. "The math says were still alive. Now we have to go to Ukraine and win." 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