Boston Bruins coach Bruce Cassidy ripped Washington Capitals forward Tom Wilson for what he called "a predatory hit" on defenseman Brandon Carlo in Friday night's game at TD Garden.

Carlo went down after Wilson went hands-high to his head in the corner behind the Boston net, smashing the defenseman's head into the glass with 90 seconds left in the first period. Carlo absorbed a cross-check from Jakub Vrana on his way to the ice and remained there for several minutes.

Cassidy said Carlo left the arena in an ambulance and went to a hospital but could not confirm that he suffered a concussion.

"Clearly looked to me like he got him right in the head. A defenseless player, a predatory hit from a player that's done that before," Cassidy said of Wilson. "I don't understand why there wasn't a penalty called on the ice. They huddled up, but I did not get an explanation why."

During his eight-year career with the Capitals, Wilson has been one of the most penalized -- and most suspended -- players in the NHL. He is 10th among active players for penalty minutes, trailing only those who have been in the league five or more years longer than him.