Leeds United fans were left feeling aggrieved about one particular refereeing decision in their 4-3 defeat to Liverpool on Saturday.
Marcelo Bielsa's men put on a spirited display at Anfield but ultimately came up short in their first Premier League outing for 16 years.
Though, Leeds did help Liverpool on their way, conceding two penalties in the defeat.
The second of the spot-kicks and the winning goal couldn't have been much clearer, Rodrigo Moreno clearly catching his man in the box.
But the first penalty was cause for debate with many Leeds fans unhappy about the way the handball rule was enforced for the incident involving Robin Koch.
So, was it a correct decision? The Premier League rules read: "Premier League players will be allowed extra leeway when it comes to ricocheted handballs.
"It is often impossible to avoid contact with the ball if it has deflected off the body of an opponent, teammate, or even another part of the own player.
"So a handball will not be awarded if the ball touches a player's hand/arm directly from their own head/body/foot or the head/body/foot of another player who is close/nearby."
But there's a little more to it than that, and further explanation from UEFA's head of referees Roberto Rossetti helps clarify why the incident was called correctly despite the ball ricocheting off Koch's thigh and onto his arm.
Rossetti said: "The big challenge is the position of the arm...If the defender is making the body bigger in order to block the ball it is not fair.
"It is different if the defender is challenging or playing the ball and it rebounds."
"If he is looking to block a cross or a shot on goal and the player is trying to spread his body then it is a handball."
Due to the fact Koch's arm was outstretched, intentionally or not, and because he wasn't making an honest attempt to play the ball, the penalty call was correct by Michael Oliver despite the deflection.
Last season, that likely wouldn't have been the case with the Premier League using its own rules for defensive handballs.
But ahead of this season, FIFA instructed the Premier League to use UEFA's rules, making this incident a handball and the correct call regardless of that nick off the thigh.
