It's funny. I was just going to talk about this, but I wasn't going to be complimentary. There was some stuff that happened earlier in the game that led up to this, so I sort of get why Domi went after Garbutt, but not really.
In the 2nd period with the Ducks up 3-1, the puck was in the ANA zone and OEL pinched down the boards. He gave Perron a forearm to the back of the head (it was not bad, but he initiated the exchange), so Perron turns and gives OEL a nasty little Crosscheck to the ribs below the padding. The response was a little over the top, but it looked to me like OEL might have milked it a little. They both get penalties, and the Yotes were not happy. They went after Perron a couple of times, but he was not going to fight (typical Perron).
With about 2 minutes to go in the 3rd, Garbutt lays a big (clean) hit on OEL, then skates away as the play continues. First Duclair, then Domi chased after Garbutt with Domi finally jumping him and throwing punches while Garbutt still had the gloves on. I get that Arizona probably felt that OEL was being targeted by ANA, but the bottom line was that it was a clean hit. If you are going to play in the NHL, you need to expect to get hit occasionally. Players jumping other players after clean hits has always been one of my pet peeves. Sometimes, you can tell the teammate didn't see the hit and is just reacting to the result. In this case, the play was right there in front of them.
I think what annoyed me more than anything else, was the ARI announcers celebrating Domi jumping Garbutt from behind and saying "good for him" and that it "had to happen". Why, because OEL got knocked on his butt? I hope they are Ok with it if next time the two teams play, somebody jumps Domi and beats him up.