Racing 92 have withdrawn their two monstrous props at half-time. Viliamu Afatia and Ben Tameifuna - with a combined weight of 268kg - are off, replaced by the slightly more svelte figures of Eddy Ben Arous and Cedate Gomes Sa respectively.

Finn Russell gets the second half under way, and Racing immediately knock on from the kick-off.  Sloppy stuff from the French champions.   

Racing's tackle statistics do not make for pretty reading - unless you're a Glasgow fan.

The French champions have missed 21 of the 63 tackles they've attempted this half.

Image source, BBC Sport

Peter Wright
Former Scotland prop on BBC Radio Scotland

We talked about Jonny Gray being a Lions contender before kick-off.  But is Glasgow hooker Fraser Brown making his own case for inclusion?   

"If Fraser Brown gets his throwing-in right, I think he is a dark horse for the Lions.  He brings you a level of physicality, he is intense and he is a winner and one of the best hookers in Europe for me.  He has got a bit of X-factor about him."  

Tom English
BBC Sport Scotland at Scotsoun

"It is ambitious, it is thrilling, this is a weighty Glasgow performance. We don't want to get too carried away, but this is potentially not just quarter-final form but potentially tournament winning form. They are laying waste to this Racing side.  It was a terrific first-half performance. They have sent a message out to the entire tournament.  The top teams will look at that and think 'this is serious stuff'." 

Here are just two statistics that go some way to showing the extent of Glasgow's dominance.

The hosts have earned 66% possession and 76% territory in the first half.

Image source, BBC Sport

Good response from Racing, who fashion a chance right before half-time. But left wing Marc Andreu doesn't manage to ground the ball, as Tommy Seymour bundles him to the ground right in the corner, and the TMO declares a 'no-try'. And that'll do for a stunning opening salvo from the Warriors. 

Do Glasgow have this game in the bag already approaching half-time?  It's been one-way traffic for most of the first half, and Finn Russell bangs over another three points from in front of the posts.   

Fraser Brown cut a delicious line off Finn Russell and powered past the Racing rear-guard to score Glasgow's second try.

Image source, SNS

Peter Wright
Former Scotland prop on BBC Radio Scotland

"It’s the speed of the breakdown, theyre getting the ball back pretty quick and Racing's defence can't get organised in time. They’re just not getting that opportunity to get set."

Another patient Glasgow attack, and a lovely floated pass from Fraser Brown almost puts Stuart Hogg in at the left corner, but the full-back is held just short.  

Former Scotland Sevens captain Colin Gregor on Radio Scotland: "Racing have had no answer so far to the variety and pace of Glasgow's attack, and the physicality of their defence." 

Sustained accuracy and control to Glasgow's attack, and Racing fall offside a few metres from their line.  Referee George Clancy plays advantage, but the Warriors are held up short of the line and Clancy takes them back for the original infringement.  Finn Russell dispatches the penalty to put Glasgow further ahead.   

Brilliantly-timed offload from Fraser Brown, who's having a storming game, releases Glasgow wing Lee Jones on a slashing break, before he's scragged by Machenaud and Carter.  But a quick tap penalty and Warriors are still on the attack, in the Racing 22...

Glasgow have been camped in the Racing half since scoring their second try, and Dan Carter has been forced into several relieving defensive kicks to touch. No let-up from the Warriors at the moment through - another big carry from hooker Fraser Brown, an attempted chip through from Russell...but Racing wing Marc Andreu collects and scampers away up the left touchline. 

Josh Strauss capped a fine attacking move to open the scoring for the Warriors on his 100th appearance.

Image source, SNS

Racing centre Anthony Tuitavke has been forced off with an injury.  That brings ex-All Blacks wing Joe Rokocoko into the fray.   

Peter Wright
Former Scotland prop on BBC Radio Scotland

"This is probably the best 13 minutes of rugby I think I have ever seen from Glasgow."