Arsenal goalkeeper Bernd Leno insists a law change created the confusion for their 2-2 draw at Watford.
At the key moment, Sokratis Papastathopoulos collected the ball from Leno in the box from a goal kick, before his pass was snatched by the grateful Gerard Deulofeu.
Tom Cleverley then thumped the ball home before Roberto Pereyra earned the Hornets a point from the penalty spot.
New rules installed before the start of the season now state that the goalkeeper does not have to pass the ball outside the box from a goal kick.
That invites defenders to start the phase of play form inside the box, encouraging teams to play short and out from the back, something Unai Emery likes.
Leno has since revealed that the law change has complicated things for the Arsenal defence as Sunday's punishment proved.
It has changed the game a lot because the first pass is always without pressure to, for example, the centre-backs," the German told the Evening Standard.
The first pass is always without danger and then the team can decide [from there].
"It is more difficult now [when teams] press very high for the defending team. But you see, the rule changed the game a little bit and it is new for everybody. We have to work with this change."
