I think the point here is that a load of people have said that what Greig did was a nothingburger and another load of people have said it's some grave sacrilege for some reason. I don't think it's unreasonable for him to have not even thought it was a big deal, or at worst thought it'd end with a Leaf getting in his face or wanting to drop gloves.
Rielly vastly overreacted, and that's not on Greig to have anticipated.
And holy cow, I've really learned that a load of NHLers are really mentally soft if the sight of an opponent shooting hard into an empty net is rage-inducing for them. He didn't intentionally injure an opponent or drop a deuce on the Leafs logo for crying out loud.
This whole thing is as asinine as a pitcher headhunting a batter for having the gall to admire a home run.