South Sydney halfback Adam Reynolds showed nerves of steel to kick three field goals in the last 10 minutes and help the Rabbitohs to an incredible 13-12 semi-final win over St George Illawarra.

In one of the more memorable NRL finals in recent years, Reynolds made the most of a bizarre Dragons decision and kicked the match-winning point with just 15 seconds remaining on Saturday evening.

The come-from-behind victory will now see South Sydney meet the Sydney Roosters next Saturday for a berth in this year’s NRL grand final.

The Rabbitohs – who will know they need to play much better if they are to beat the table-toppers next week – were staring defeat in the face when Cody Walker gave away a penalty with just five minutes remaining at ANZ Stadium.

South Sydney led 11-10 at that stage, but Zac Lomax kicked truly, nudging the Dragons in front by one point.

Reynolds levelled proceedings with three minutes to go, though, with his second field goal setting up a grandstand finish.

And when the Dragons inexplicably decided not to kick on the final play of their next set, the Rabbitohs were within striking distance of yet another field goal.

It was a hell of an ask for Reynolds, though, given he had already converted two chances under intense pressure.

But the halfback stood up again, booting the telling field goal to spark wild celebrations among the Rabbitohs faithful.

Adam Reynolds wins it for the Bunnies with a third field goal.

Sensational! #NRLSouthsDragons

Watch LIVE: https://t.co/aZwCpmv6rd
Follow LIVE: https://t.co/gvl4I0IyHT pic.twitter.com/44n4rcqe5o

— Wide World of Sports (@wwos) September 15, 2018

When quizzed about St George’s decision not to kick on the last play of their final set, Reynolds told Fox Sports he was baffled.

“I couldn’t believe what was going on,” he said.

“I thought they’d just kick long and try and play a bit of field position as we did.

“It worked in our favour and gave us a chance and credit to our boys – they got me in the position [to kick the winner].”

Rugby league legend Phil Gould echoed Reynolds’ thoughts on the Nine Network.

“I don’t get it. I just don’t get what they were looking at,” Gould said.

“I don’t understand the play … what makes a team do that on tackle five, with a minute left on the clock?”

James Graham consoles Ben Hunt after St George’s narrow defeat. Photo: Getty

Reynolds – who scored all 13 of South Sydney’s points – remained modest about his achievements but acknowledged he had “never thought about kicking three field goals in my life”.

“We dug deep and fought right to the end,” he added.

“[We] wasn’t at our best tonight but obviously we get another chance now.”

That chance did not seem likely after a lacklustre first half from South Sydney.

The Rabbitohs could have scored a 25th minute try, only for Matt Dufty to produce a try-saving tackle to deny Alex Johnston, but it was the Dragons who shaded proceedings.

And the Dragons went into the half-time break with an 8-2 lead after halfback Ben Hunt strolled over in the 35th minute.

Hunt’s piece of skill lifted St George Illawarra and Lomax’s 53rd-minute penalty extended its lead to eight points.

Reynolds would not be denied, though, firstly bringing the Rabbitohs to life with a 55th-minute try that he initially set up with a neat pass for Angus Crichton.

And after he converted that try, Reynolds booted a penalty to level proceedings.

His first field goal followed, and although Walker’s indiscretion – following a brilliant Tyson Frizell strip – looked to have cost South Sydney, Reynolds had other ideas.

Making Reynolds’ efforts more impressive was the shoulder problem he was battling.

And he kept producing the goods as the Rabbitohs, who lost by one point to the Melbourne Storm last week, responded with a thrilling win of their own.

South Sydney played the Roosters twice in the home-and-away season, winning the first encounter 26-14 in Round 6.

The Roosters proved too strong last month, though, edging a tight contest 18-14.