All I can say is ouch, at first thought that the play should have been stopped because Boston Bruins goalie Tim Thomas had his masked knocked off of his head, however, it does appear that the refs made the right call according to the rulebook.
9.5 Protective Equipment - When a goalkeeper has lost his helmet and/or face mask and his team has possession of the puck, the play shall be stopped immediately to allow the goalkeeper the opportunity to regain his helmet and/or face mask. When the opposing team has possession of the puck, play shall only be stopped if there is no immediate and impending scoring opportunity. This stoppage of play must be made by the Referee. When play is stopped because the goalkeeper has lost his helmet and/or face mask, the ensuing face-off shall take place at one of the defending team’s end zone face-off spots.
