Boston Bruins center Gregory Campbell (11), left, and Washington Capitals defenseman John Carlson (74) get physical after a play in the first period as the Washington Capitals take on the Boston Bruins in game four of National Hockey League first round playoff hockey at the Verizon Center, Washington, D.C., Thursday, April 19, 2012. (Andrew Harnik/The Washington Times)

Photo by: ANDREW HARNIK

Boston Bruins center Gregory Campbell (11), left, and Washington Capitals defenseman John Carlson (74) get physical after a play in the first period as the Washington Capitals take on the Boston Bruins in game four of National Hockey League first round playoff hockey at the Verizon Center, Washington, D.C., Thursday, April 19, 2012. (Andrew Harnik/The Washington Times)