Prust connected with an elbow to the back of Volchenkov's helmet shortly after the Devils' defenceman chipped the puck out of his zone in the second period. Volchenkov was down on the ice for close to a minute, but did continue playing. No penalty was called on the play.
"It was pretty hard, but I finished the game," Volchenkov told the Associated Press after the game. "It's not bad."
Rangers forward Carl Hagelin was suspended three games for a similar hit on Ottawa Senators' forward Daniel Alfredsson during their first round series. Alfredsson, however, was injured on the play and left the game.
Prust has one assist in the playoffs for the Rangers.