Backes and Ference

Let me preface this with I am a Bruins fan, I also have to admit that admire the way that David Backes plays the game of hockey. Let's look at this hit, its a text book legal shoulder check. Breaking it down further; Backes puts an awesome, legal and violent check on the Bruins Marc Recci, who gets up and skates away. The problem I have is why should Backes have to fight? It wasn't charging, Recci wasn't hurt and it wasn't a dirty hit.