During the 3rd period, while Mitch Marner stood in front of the Islanders' bench, Mat Barzal reached out and grabbed Marner's jersey. The grab on Marner's jersey prevented him from getting involved in the play as he wanted.
The likeliest outcome would be for Barzal to receive a fine for this play, but in my opinion a $5,000 fine doesn't do enough to discourage this behavior in the future. If a $5,000 fine is the baseline for this action, what's to stop a player from performing similar action in a key playoff game?