Bobby Ryan fought teammate Patrick Sieloff at today’s Ottawa Senators scrimmage after Sieloff laid a hit on winger Clarke MacArthur.

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Sieloff caught MacArthur, who missed almost all of the 2015-16 season due to a concussion, against the boards and hit him in the head. MacArthur stayed down on the ice as Ryan jumped in to fight the defenseman.

Ryan wasn’t the only one unhappy with Sieloff after the hit:

The Senators acquired Sieloff in June in a trade with the Calgary Flames.

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MacArthur was concussed as a result: