Andy Nicol
Former Scotland scrum-half on BBC Two

"Scotland have had to defend for the last 10 minutes.

"They not conceded, weathered the storm and then gone up the other end to add three more points.

"That's really encouraging and builds momentum."

After Stuart Hogg's miss, Greig Laidlaw wins the right to take a shot from 46m out and on an angle. I think that might be him on the kicking duties for the rest of the match.

A mighty hoof just about creeps over the crossbar.

Denis Hickie
Former Ireland international on BBC Radio 5 live

"Ireland's defence completely disintegrated and South Africa made scoring that try look very easy. Now, the scoreboard doesn't tell the whole story. Ireland are still ahead but in the last few minutes the momentum has swung decisively behind South Africa. Ireland must score next, even a penalty, to stay in the game."

The first change of the night from Scotland as Blair Cowan makes way for Alasdair Strokosch.

Tomas Lavanini attempts to steamroller through some hard yards. Scotland are hunting in packs though. Finn Russell goes low, Alex Dunbar goes high and between them they force the second row to spill forward.

So, great decision it is then.

Someone must have called "bundle" as that's exactly what the Boks launch, and great seething mass of bodies sending Marcell Coetzee surging over the line and leaving a fairly simple conversion for Handre Pollard.

Jack McGrath is pinged at the scrum and South Africa kick the penalty to the corner rather than go for goal - great decision if they score.

If not, well...

John McEnerney:, external Great start by Ireland, now time two keep the foot on the gas and not let South Africa unleash the Abokalypse. If that happens, we're in trouble!

Ollie Castle:, external Great pressure from Ireland, defiantly the dominant team. South Africa having to make changes.

The number seven scavenger role has been a hard one today. After Richie McCaw was pinged a few times earlier today, Wayne Barnes gets stuck into Scotland's forwards as they try to seal off a ruck.

With the clock and the scoreboard against them, Argentina tap and go from the penalty.

That was like watching a harassed parent pushing a fully laden shopping trolley, such was the speed Ireland went backwards at that scrum.

The Boks win it against the head and set off on the attack but they cannot break down the Ireland defence - total commitment from the hosts.

Image source, PA

Alex Begg:, external Most exciting/clinical rugby I've seen @Scotlandteam play in forever. 40 more please.

Fraser Morgan:, external Only thing missing is flowing play from backs. Been all forwards and quick taps from Scotland so far #backingblue

Andy Nicol
Former Scotland scrum-half on BBC Two

Image source, PA

"More brilliant awareness there from scrum-half Greig Laidlaw.

"He went to the space vacated by the Argentine defence and then it was all about Hogg's pace to get to the corner."

Argentina have been playing disjointed, aimless, meandering rugby. They finished third at the 2007 World Cup. You would not put a whole heap on them repeating the trick next year.

Greig Laidlaw keeps the scoreboard ticking with a well-struck conversion.

Ryan Judson:, external This Ireland outfit is very impressive, and Sexton just gets better and better. Best 10 around at the moment perhaps?

Andrew Priestley: , externalGreat from Ireland! Great kick, chase and take from Bowe, excellent tactical kick from Henshaw and a brilliant driving maul try.

Denis Hickie
Former Ireland international on BBC Radio 5 live

"Great start to this half from Ireland, although there's an awful lot of rugby still to be played. But an ideal start to the second period if you're Irish, and terrible if you're a South African."

Image source, AP

Four tries and, if there was a bonus point, Scotland would have it bagged.

Nicolas Sanchez, the Argentina 10, goes walkabout, circling round a ruck when the ball is not out. He leaves a gaping gap on the fringe which Greig Laidlaw is through like the proverbial rat down the drainpipe. Stuart Hogg bursts up to support his skipper and gets his reward with an offload and saunter into the corner.

Argentina had not been able to get the likes of Juan Martin Hernandez up and running in the first half. The Pumas show a little more ambition early in the second though, offloading out of tackles and trying to prise open a solid Scotland defence.

And that start just got even better...

Ireland win the line-out, shift the drive and Rhys Ruddock explodes through the Boks and plunges over.

Jonathan Sexton converts from wide out and a 10-point lead in a tight game suddenly looks very pretty indeed.