The Rangers forward left the game after a hit gone awry appeared to knock him out.
Powe may have been unconscious after the hit, and stayed motionless on his back before eventually getting to his knees. New York Rangers trainer Jim Ramsey attended to him at center ice, and eventually Powe was helped to the dressing room by his teammates.
No penalty was assessed on the play, as the situation was the result of bad luck rather than any malicious intent.
Powe was acquired earlier this season by New York. having previously played for the Minnesota Wild and Philadelphia Flyers. Powe, known for his penalty killing and physical play, has yet to score this season.
Since any head injury raises the possibility of an accompanying concussion, Powe will likely be subjected to the NHL concussion monitoring protocols, and is doubtful to return in Sunday's game.
Update: Video of the incident from HockeyVideoHD: