Will Fraser
Former Saracens flanker on BBC Radio 5 live sports extra

At the start of the half, Glasgow were making good yardage around the fringes, but Saracens appear to have fixed things up in game there, realising that they need to shore up.

Bit of niggle here after Chris Fusaro gets himself over the tackler and wins Glasgow a penalty. Saracens players complaining about something, and a few players squaring up to each other.

But it's quickly dissipated and we're away again. Breathless pace to this game.

Rory Lawson
Former Scotland captain on BBC Radio 5 live sports extra

More changes for both sides. Flanker Callum Clark and scrum-half Richard Wigglesworth are on for Sarries, Kevin Bryce at hooker or Glasgow.

Brilliant tackle from Maro Itoje, who stops Tommy Seymour in his tracks and then rips the ball away from the Glasgow winger.

Scotland centre Huw Jones is on, with Sam Johnson departing for a head injury assessment and Nick Grigg moving to inside centre.

Jones has struggled for game time in recent weeks, and could do with a hit-out with the Six Nations only a fortnight away.

Image source, Getty Images

Glasgow forced into another change, with number eight and captain Ryan Wilson forced off, and youngster Matt Smith - called into the squad this week after injury to the other co-captain, Callum Gibbins, coming on.

From a Scotland perspective, let's hope the departures of Gray, and now Wilson, are nothing untoward.

Gregor Townsend is already fretting over Edinburgh flanker Hamish Watson, who suffered a suspected broken hand against Montpellier last night.

A Sam Johnson break kick-starts another spell of Glasgow pressure, but Saracens are ferocious at the breakdown and a combination of Jackson Wray and Maro Itoje force a turnover to deny the visitors.

Both players are back on their feet, mercifully.

Good pressure from Glasgow to force Saracens wing Alex Lewington into a hasty clearance inside his own 22.

Jonny Gray is the player who went off at half-time by the way. And without him, Warriors hooker Grant Stewart can't find his man at the line-out.

Injury concerns here for both sides...

Glasgow wing DTH van der Merwe has taken a blow to the face attempting a tackle, and is having some claret mopped up.

Wales' Liam Williams, who only returned from a hamstring injury two weeks ago, is also receiving treatment.

The players are back out, and Adam Ashe is on as a replacement for Glasgow. Just trying to establish who he;s come on or, as Alex Goode gets us back under way.

Although they trail at half-time, Glasgow won't be unhappy with the way this game has unfolded, given the scenario at the outset.

Remember, to top the pool they need a bonus-point win and to deny Saracens a bonus point.

The visitors have three tries so one more and they have a bonus point in the bag. Then they just have to go on and win the game by more than seven points.

More pertinently perhaps, they have to prevent Saracens scoring another try for the entire second half.

You wouldn't put your mortgage on that outcome.

Saracens are very much in the box seat for a home quarter-final.

Rory Lawson
Former Scotland captain on BBC Radio 5 live sports extra

Glasgow have looked as effective as I have seen them in the last six weeks. They did not come into this game in the best of form.

Will Fraser
Former Saracens flanker on BBC Radio 5 live sports extra

It has been a brilliant game and I don't think any of us expected that. Round one between these two teams was niggly and cagey; this meeting has been open and free-flowing. Which is probably much more to Glasgow's liking than Saracens'.

What a bonkers half of rugby. Six tries, three for each side. The lead changed hands four times.

More of the same in the second half please.

Scrum to Glasgow, centre-field, 10m inside Sarries' half. Warriors go left but Adam Hastings' short pass is coughed up by Nick Grigg, under pressure - and possibly a high tackle - from Alex Lozowski.

Nice little cross-kick from Stuart Hogg to find Tommy Seymour as Glasgow launch an attack down the right flank. Ben Spencer is back to cover, and Glasgow centre Nick Grigg taps the scrum-half's clearing kick forward as he tries to intercept.

Rory Lawson
Former Scotland captain on BBC Radio 5 live sports extra

Image source, PA

It is so hard for the open-side flanker Chris Fusaro there (for the last try). He is trying to shore up the scrum to prevent the pushover, while being on his starting blocks to get off and get a tackle in on Billy Vunipola.

I think he maybe just kept his head down and bound on a fraction of a second too long.

Three tries apiece...and counting.

Undaunted by falling behind, Glasgow counter attack from deep and DTH van der Merwe skips away from a couple of tacklers on halfway. But the prolific winger's offload out the back of his hand goes to ground, rather than into Stuart Hogg's hands. Shame.

Will Fraser
Former Saracens flanker on BBC Radio 5 live sports extra

It is not often in modern rugby that you see a number eight pick and go from five out and plough over. But that just shows how powerful Billy Vunipola is.