I disagree on the hit and the penalty issued says as much.
If the league doesn't suspend players for those types of hits, then expect to continue seeing goons like Reaves f*** you up after that. Isn't this what hockey people want? They want the players to police the game? Or did this break some unwritten code that suggests you can't attach/maul someone after a whistle, but you can bust their face in with your fists. People are mauled after whistled all the time (and way too much in the playoffs). If Graves doesn't fall, or doesn't get hurt there, there's no suspension.
Of course Reaves is a goon. Hockey loves goons - the rules and culture are designed to have goons.