Wow! Crazy this is even a discussion. How often do defenseman have to take getting creamed into the boards for going into a corner to fetch a dump in. They can't hit back?
When a person has the puck, even touches it, they are open season to get trucked. Heres the thing, that should also mean that if you have the puck then you can demolish anyone coming to try and take it. Like a running back is allowed to hit anyone coming for them. Dahlin beat him to the puck and shielded against what normally would be a hit coming, and absolutely intended to make the player pay for hitting him. Just because the player tried to p*ssy up at the last second doesn't make that interference.
Hockey needs more hitting back in it.....not less.