Fremantle coach Mark Harvey has queried why players such as Hawthorn's Lance Franklin are afforded a natural arc in their set-shot run-ups while others are denied it.

Harvey raised the issue after umpires' boss Jeff Gieschen revealed Hayden Ballantyne's after-the-siren poster against West Coast on Sunday should have been disallowed because he ran off his line.

Ballantyne received the free-kick where the 50m arc intersected the boundary line after West Coast's Matt Rosa was penalised for deliberate out of bounds.

But with man-on-the-mark Quinten Lynch standing two metres inside the field of play, Ballantyne was also well inside the field of play when he kicked the ball after arcing to his right during his run-up.

In the end the kick didn't affect the final result, with the Eagles holding on to win by one point.

But Harvey was confused with Gieschen's ruling.

"It's going to be interesting when he shoots for goal Buddy," Harvey said ahead of Saturday night's clash with Hawthorn in Perth.

"If they determine that Ballantyne was running off on an angle or taking one or two steps then these guys and (Josh) Kennedy from West Coast are in the same boat.

"When they take a step or two sidewards in their run-up, is it going to be called play on?

"The other interesting aspect is guys like Steve Johnson, who will have a set shot and turn side on and the minute they take a step when they're kicking around the corner, that's play on too, so the umpires are going to have to govern this quite stringently.

"Forever and a day when you've kicked goals, most players I reckon, 80 per cent of players don't run straight.

"They will have some sort of arc or deviation in the way that they kick and that's natural and I'm not sure why we're actually looking at it any other way."

West Coast coach John Worsfold didn't seem to have any concerns over the Ballantyne kick, other than saying Lynch should have been directly on the mark so as to make Ballantyne's movement inboard more obvious to the umpire.

"It would be accurate to say that I did show our group that Lynchy should not have moved off the mark where it was set, because it just would have highlighted the difficulty of the angle ... in Ballantyne's own mind, but also for the umpire to see if he had stepped off it," Worsfold said.

"The fact that Lynchy came off the mark by a metre or two and around a bit - that's a leaning curve for us.

"Next time we're in that situation, after the siren, on the 50m boundary line - we're ready for it."

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