Mitch Marsh believes Jos Buttler had little option but to walk on day three of the second Ashes Test.
Kumar Dharmasena initially shook his head in response to a spirited caught-behind appeal from Nathan Lyon at Lord's, only for Buttler to turn on his heel and trudge off.
Some pundits applauded Buttler's sportsmanship.
Marsh pointed out Australia had one review in the bank and Michael Clarke was ready to send the verdict upstairs.
"Jos walked because he hit it. I think with DRS these days it makes it pretty simple," Marsh said.
"If you hit it and the fielding team goes up and they've got reviews left you know they're going to review it.
"You may as well walk."
England wicketkeeper Buttler and counterpart Peter Nevill were involved in another tense situation during Saturday's second session.
Nevill claimed a remarkable catch to dismiss Buttler for nine, with Dharmasena giving it out out but wanting third umpire Chris Gaffaney to have a look.
Gaffaney overruled Dharmasena's on-field verdict, claiming there was conclusive evidence it scraped the turf.
Clarke seemed a little miffed at the time as he sought clarification from umpire Marais Erasmus.
However, Marsh insisted Australia were content with the process.
"Nev just thought it went in," the allrounder said.
"He thought he got his finger under it.
"It's probably why we've got cameras now and the right decision was made in the end.
"It was a fantastic effort to get to that catch."
It mattered little, Buttler added four runs before he was on his way.
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