These criticisms began especially in light of his decreasing offensive production following the 2004–05 NHL lockout. The decline was often attributed in the media to him becoming more defensively responsible under new Canucks coach Alain Vigneault. Bertuzzi's absence following the 2005–06 season was also seen as a negative factor for Näslund individually. It was further proposed that the physical effects of his concussion, as a result of Steve Moore's hit against him in 2004, as well as the emotional toll of Bertuzzi's subsequent retaliation against Moore strained his playing efficiency.