from Kevin Paul Dupont of the Boston Globe,

The Bruins knew Grzelcyk was concussed before he left the building around 9 p.m. for further testing at Massachusetts General Hospital. It was obvious even before he finally got back on his feet, aided by teammates David Krejci and Jake DeBrusk, following the big smack into the glass he took from hard-charging Blues forward Oskar Sundqvist. Cassidy announced late the next morning that Grzelcyk had been placed “in protocol,” subject to the league’s restrictions on return to play, and would not make the trip to St. Louis for Games 3 and 4 of the Final.

In such obvious concussions cases, or even in instances not as blatant, the league would be wise to allow clubs to make an immediate roster substitution. In Boston’s case, Cassidy could have enlisted the aid of, say, John Moore or Steven Kampfer, either of whom easily could have been suited up by the start of the second period.

To protect against an abuse of the policy, the league could demand the concussed player not be eligible to participate in his club’s next two games.

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