The shot was a precautionary measure.
The incident potentially occurred during a scrum when Pacioretty grabbed Grabovski from behind while he was jostling with Canadiens forward Brandon Prust. Pacioretty's arm comes across Grabovski's face with his hand grasping the side of the Toronto forward's helmet.
It appears as though Grabovski's mouth was covered by Pacioretty's forearm and the two wrestled a bit before Pacioretty emerges with his arm extended as if to show something had happened to the area. Both players were given 10-minute misconducts on the play, with Grabovski earning an extra two-minute minor for roughing.
Grabovski has a phone hearing scheduled with the NHL on Monday afternoon, which was originally supposed to occur on Sunday.
This incident is merely another addition to the strange history of biting in the NHL.