That sequence is why there is fighting in hockey. This is a contact sport, played at 35 MPH, with a weapon. There has to be a release valve, or else things will completely boil over. I think we all understand that you cannot always count on the officials to administer justice properly - often times the game has to self police.
This was Mathew Dumba's debut in a Portland sweater. As the video clearly shows, Eberle comes in high on Dumba, as is demonstrated by the assessment of a 2 minute minor. Cederholm stands in for his newest teamate - he holds Eberle accountable for his actions.
Some would argue that simply taking the powerplay is the right move, but do you really want to leave these things in the hands of the referees? There are players better suited for fisticuffs than Cederholm, but when you're on the ice & the first man there sometimes you've gotta get in there.
In this instance, Eberle got 2 for the initial hit, and Cederholm picked up an extra 2 + 10 for instating, negating the powerplay & leaving the 'Hawks short a defenseman for a 17 minute stretch of the game. There were real consequences for Cederholm's actions there, and I'm just fine with that. There are plenty of times that you will "invest" a 2 minute minor (or worse) to send a message - in this case the message is not to take cheap shots at our new star defenseman.
Even in instances where you give up a powerplay goal - that's still a better price to pay than allowing some goons to take runs at your guys.
Another piece of this puzzle is these two defencemen probably don't even know each others names yet - and in Dumba's 1st game in Portland he sees his new family going to bat for him. These occurrences often times go a long way in team building - helping to jell as a group. That's pretty important this time of year.