Boston Bruins camp: Captain Brad Marchand is sitting out Game 4 against the Florida Panthers this Sunday. The Bruins are trailing 2-1 in the second round series, so every player's absence is felt. Marchand got blindsided by a sucker punch from Sam Bennett during the Bruins 6-2 game 3 loss and that took him out for the rest of the match. <div align='center'><blockquote class='twitter-tweet' data-lang='en'><a href='https://twitter.com/renlavoietva/status/1789665852645609845'> </a></blockquote></div> <div align='center'><blockquote class='twitter-tweet' data-lang='en'><a href='https://twitter.com/SavageSports_/status/1789296381363921343'> </a></blockquote></div> Fans are speculating it might be a concussion, and Bruins' head coach, Jim Montgomery, wasn't shy about expressing his frustration with Bennett's move. <div align='center'><blockquote class='twitter-tweet' data-lang='en'><a href='https://twitter.com/TSN_Sports/status/1789452912713740501'> </a></blockquote></div> NHL insider and podcast host Rich Keefe tweeted that Marchand will miss not just Game 4, but also Game 5 due to concussion protocol. That's a blow for sure, considering Marchand's a key player for the Bruins. <div align='center'><blockquote class='twitter-tweet' data-lang='en'><a href='https://twitter.com/Keefe21/status/1789352687643111764'> </a></blockquote></div> <div align='center'><blockquote class='twitter-tweet' data-lang='en'><a href='https://twitter.com/bellefraser1/status/1789664459465605428'> </a></blockquote></div> Boston will need all the energy from the TD Garden crowd they can muster as they aim to level the series against the Panthers on Sunday.