If Matthews or Marner slapped a puck like that into an empty net I would expect a response similar to what Rielly or even Domi did tonight.
and what does fighting have to do with this. Who's fighting who exactly?
The 21 year old rooking with less than 60 games isn't fighting anyone.
He's hoping he doesn't get hurt and can make the NHL again next year.
And that's the smart, sensible thing for him to prioritize.