I wouldn't fret over it.
Pettersson had 12:18 of ice time, and that's with the amount of penalties this game had. He had more ice time than guys like Kempe and Paajarvi who had 11:42 and 11:27 mins.
The lowest was Lias Andersson at 6:42, who's also 19.
Also had a shot on goal. Most definitely an off game.