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 Caps took on the Bruins in game four of the National Hockey League's first-round playoffs at the Verizon Center in Washington on 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 Caps took on the Bruins in game four of the National Hockey League's first-round playoffs at the Verizon Center in Washington on Thursday, April 19, 2012. (Andrew Harnik/The Washington Times)