Here is the thing, Brad Marchand is a dirty player and with his reputation and history, I don’t think he should get a pass especially when it injured another player. Depending on who you are reading you get between it’s unfortunate to dirty. Here is the play
There is no reason for Marchand to avoid him that way. If he just checks him sure it’s an interference penalty but it would not have caused a knee injury. Plus he sticks his arm out to close line him which isn’t unfortunate, it’s the reason his knee gets caught and gets injured.