Not dirty imo.
Lundqvist mistimed the handling of that puck. First, he wanted to stop it and leave it for his defender then saw the defender was expecting a pass so he went back to play it. Eakin is not letting up on the play and the speed at which he was going, the space he had behind the net, and Lundqvist's mistiming resulted in Lundy in a heap on the ice.
Had Lundqvist not mistimed that pass, the puck would've been on his defenders stick and Eakin would have simply used that space where he hit Lundqvist to maintain his speed as he swings back into his own zone.