Fremantle coach Ross Lyon is sticking with a long-held vow of near-silence about AFL umpires.

The Dockers conceded goals from two 50-metre penalties in Sunday’s 17-point loss to Adelaide.

In the third term, Brad Hill was penalised for throwing a piece of turf at Crow Lachlan Murphy while he was shooting at goal.

Murphy sprayed the kick but, due to Hill’s act, was given a 50m penalty and another shot, which he converted.

Lyon maintained he hadn’t seen the replay of the incident.

“Was it … marginal?,” Lyon said.

“The grass, or was it a clump of grass – I don’t know.

“The vision would tell us that. But probably to the strict letter of the law you probably shouldn’t throw some grass.”

Then, with Fremantle just six points down midway through the last term, Lyon’s team copped another goal from a 50m penalty.

After the Dockers kicked out-on-the-full, Freo’s Darcy Tucker dropped the ball instead of giving it to Adelaide’s Alex Keath.

“Sometimes the rub of the green doesn’t go your way,” Lyon said.

But the Dockers boss wasn’t buying into further detailed discussion, recalling the 2009 grand final when his then-club St Kilda lost to 12 points to Geelong in a game featuring a wrongly awarded goal to Cat Tom Hawkins from a kick which struck a post.

“I have never really commented about umpires, even after losing grand finals when the ball has hit the post for a point in ’09, so I’m not going to start talking about (umpires in) a home-and-away game,” he said.

“The game has got enough beauty in it and enough analysis without drilling in.

“Our umpires have an incredibly difficult game to umpire, I think they do a very good job. Players make more mistakes than umpires.”