Glasgow have seen plenty of the ball in the opening exchanges of this half.

They win a penalty and kick for the corner.

Duncan Weir reckons his grubber kick took a deflection off a Bulls player before it crept out.

He rolls his eyes when the referee disagrees.

Morne Steyn gets us back under way...

It has been a theme of Glasgow's season that they have struggled to put together 80-minute performances.

As they did last week, the Warriors took an early lead, but have fallen away - they require a colossal effort in the second half, especially as they start it with 14 players.

Danny Wilson will be furious. Glasgow were second best in the opening half, but after Morne Steyn missed that penalty, the Warriors should have really gone in level.

As it is, they will have to come from behind.

The Bulls really want the half-time lead, and are hammering on the Glasgow door.

Zander Fagerson is pinged again and the referee shows him a yellow card for repeated offences.

Morne Steyn kicks into the corner... huge chance.

Wow, I don't think anyone expected Morne Steyn to miss from there.

You'd put your house on a man of his class, but he drags the kick wide.

It's all getting a bit feisty in Pretoria, and the penalty count on both sides is rising.

Zander Fagerson infringes again - the Bulls will have a kick at goal to go in front.

A great tackle from Duncan Weir stops James Verity-Amm in his tracks, and Glasgow then win a penalty - the winger carried on moving after the tackle was made.

Absolute chaos.

No-one in a Bulls shirt was able to gather the loose ball after another accurate kick from Ali Price.

Ryan Wilson swooped, but his hacked kick through rolled dead.

A chance from nothing.

A deft kick over the top from Ali Price forces the Bulls back - Glasgow can apply some pressure here.

Ryan Wilson and Rory Darge are now both getting treatment from physios - Danny Wilson wouldn't want to lose either of those two.

The Bulls fly-half knocks over a penalty from 40m out, and it's all square again.

Zander Fagerson lost his battle at the scrum and conceded the penalty.

Stafford McDowall runs a great line to take Glasgow into the Bulls 22, but the visitors cannot take advantage - Johan Grobbelaar gets over the ball and wins a turnover.

Rob Harley misjudges the restart, and gifts possession back to the Bulls.

Glasgow's fly-half calls for his kicking tee, and makes no mistake.

The Warriors regain the lead.

Glasgow are getting over the gain-line, and win a penalty after Ollie Smith gets hammered in the tackle.

Ruan Nortje didn't make any attempt to wrap his arms.

Morne Steyn has pulled off a couple of lovely cross-field kicks to James Verity-Amm so far - clearly something the home side have been working on.

Ryan Wilson concedes a penalty after entering a maul from the side - not all that subtle.

But now the Bulls lose their own line-out, and Duncan Weir hammers a clearance kick downfield.

Glasgow kick into the corner once more, but are foiled at the line-out by Ruan Nortje.

End-to-end stuff so far.