It's a high tackle from Gregor Brown on Sharks number eight Phepsi Buthelezi.

It's yellow rather than red as referee Chris Busby says there's not a high degree of danger.

Glasgow win a huge breakdown penalty in their own 22, as Sharks piled forward.

It's Rory Darge, as he so often does, who gets over the ball at the decisive moment.

The officials just want to check something else here...

Changes aplenty for Glasgow as Franco Smith looks for some much-needed impetus.

Sam Talakai and Johnny Matthews are on in the front row, while Gregor Brown and Jamie Dobie are also introduced.

Captains Sione Tuipulotu and Eben Etzebeth are reminded of their responsibilities.

Referee Chris Busby says there was nothing wrong with the tackle that sparked it.

On we go...

In a contest as physical as this, I'm surprised it's taken this long for a bit of aggro.

All 30 players pile in to make acquaintances and the officials will need some time to pick the bones out of this.

The game has entered something of a lull in the last few minutes, which suits Sharks just fine.

Glasgow take a lineout quickly and Josh McKay steps his way over halfway.

Scott Cummings takes his eye off the ball, knocks-on and the chance is gone.

George Horne and Zander Fagerson are both receiving treatment. There are some sore bodies out there.

Henco Venter replaces Jack Dempsey.

Phase after phase for Glasgow, but Sharks have the answers in defence so far.

Brilliant defensive hustle from Glasgow, as they pin Aphelele Fassi into a corner and drive him back over his own line.

The visitors have a five metre scrum and a great platform from which to attack...

Straight through the middle.

A big Sharks scrum wins a penalty, and Jordan Hendrikse gestures at the posts.

Sharks are the team on the front foot at the start of this second half.

Glasgow need a big defensive set.

Tom Jordan gets things back under way in Durban.

A fascinating second half awaits.

Sharks played so direct in that first half, using their array of Springbok forwards to get over the gain-line, whereas Glasgow were keen to play with width and get around the Sharks blitz defence.

How confident are you feeling at home? Do you fancy Glasgow to turn this one around? Hit those thumbs.

Ryan Wilson
Former Glasgow Warriors player on Premier Sports

Both teams have made a fair few mistakes.

Franco Smith will be angry about the quick tap that Aphelele Fassi scored from, but the overall performance I think he'll be fairly happy.

Stafford McDowall decides enough is enough, and boots the ball into the stands.

That was a bruising first half - the players head for a breather.

Glasgow have possession inside their own half with the clock ticking towards 40 minutes.

Chris Paterson
Former Scotland international on Premier Sports

It looks as if Sharks are trying to raise the tempo of the game, and as soon as the penalty is given, Fassi takes the tap penalty before the Glasgow players are back on their feet.

Glasgow have to be more aware than that.