Cooke-Karlsson Round 2 explodes on Twitter

It was back in January that Ottawa star Erik Karlsson was taken into the boards by Pittsburgh's Matt Cooke, resulting in a torn achilles tendon for the Senators' defender. A war of words since then comes to a head as the teams meet in the Stanley Cup playoffs.

Ottawa star, Pens' tough guy meet for 1st time since injury

Ottawa Senators defenceman Erik Karlsson, centre, grimaces as he hits the boards after colliding with Pittsburgh Penguins left wing Matt Cooke, left, during the second period of a game in January. The resulting injury cost Karlsson most of the regular season. (Gene J. Puskar/Associated Press file )