Green said he couldn't believe the decision to award the Foran try.
"That refereeing decision is absolutely bewildering. Someone needs to explain to me what the rule is because, in my opinion, they must have changed the rule," Green said.
"If that is not an obstruction I will walk nude through Pitt Street.
"I am absolutely bewildered how they can get it so wrong and this is not just our game - this is happening too regularly.
"This needs to be better.
"What's disappointing for the game is that decisions like that are deciding outcomes; that's not good enough.
"They owe us an explanation.
"There wasn't a bloke in this ground that thought it was a try."
When asked how he saw the Foran play, Thurston said: "I saw it how everyone else saw it, except the blokes in the video box."
Manly coach Geoff Toovey conceded his team were fortunate to get the two points.
"I didn't get a good look at it (the obstruction)," Toovey said.
"I think we were probably a bit fortunate. You couldn't tell conclusively from the video.
"It was a bit of luck there but we will take it.
"But I'm sure they will be a bit upset about it."
Green did concede that the Cowboys should have been more ruthless in finishing off the game.
A first-half double to Brent Tate coupled with a 21st-minute four-pointer to Kyle Feldt put the Cowboys ahead 14-6 at halftime after Steve Matai opened the scoring for Manly in the fifth minute.
NSW State of Origin hopeful Jorge Taufua crossed for a second-half double in the 59th and 67th minutes for Manly before Foran's controversial effort, with Cowboys winger Curtis Rona scoring on his NRL debut in the 56th minute.
Daly Cherry-Evans was a late withdrawal for Manly due to a leg injury, while Anthony
Watmough didn't return for the second half after hurting his elbow in the lead-up to Tate's second try.
- AAP
