No call on the play as Matt Martin destroys Sean Couturier with a brutal hit from behind

Matt Martin’s brutal hit from behind on Sean Couturier against the boards went uncalled,
Couturier was enraged after being forced to leave the game and having the hit go uncalled.
Hit from behind, where’s the call at ref?
Are the officials getting ready for playoffs?
That was far more dangerous than what Voracek was suspended for.
Fortunately for Couturier, he came back later on during the game.
Watch him win that face-off that led to Flyers game-tying goal by Shayne Gostisbehere