Jay: Now that Stokes is in, I'm going to add 200 to the score to see how it's going. Still looks a bit worrying.

Stokes is ticking here, flicking the returning Chris Morris through mid-wicket for four, then guiding a loose delivery to long leg for another boundary.Stokes has 22 from 17 and this pair have added 30 in 23 balls. Counter-attack.

Heart-in-mouth time for Joe Root when Stokes drives the ball back and into the non-striker's stumps. For a minute, it looks like Morkel is claiming he got a touch, with Root well out of his ground. Are you teasing us, Morne? Yes, you are. About as funny as athlete's foot.

Zigzag: Surely England must regret not having Plunkett available to pick from on this pitch?

It's as if someone has hit the turbo button. One delivery is a bullet, fraught with danger, the next is being carved to the boundary. Root joins in the plan to fight fire with fire, cutting Morkel to the fence with a rapier thrust. Morkel punches back with a nip-backer than almost gets Stokes on Little Ben.

Image source, Getty Images

Ever wondered why Mark Wood starts his run-up the way he does? Or what his favourite flavour of crisps are? 

We're going to have a word with him a bit later this afternoon, and will put your questions to him. 

Send us anything you want to ask via email on tms@bbc.co.uk or use #askwoody on Twitter.

Image source, Getty Images

Is this the Bullring or the Colosseum? There's definitely lions, but they are the ones in danger at the moment. The few that are in attendance are captivated, humming a soundtrack. Oooohs and aaaahs from the crowd when Stokes throws his hands at a wide one and gets four over gully. This is Test cricket, right here. Batsman clawing for everything, bowlers prowling. Brilliant stuff.

Matt: I am being very pessimistic, but can't see Stokes lasting too long here.

Eng 98-4published at 31.3 overs

31.3 overs

Stokes changes his bat. He asks for one that is about 6ft 2in tall so he can stand behind it, but there's not one available. Rabada the bowler - take that! Short, Stokes swivels on a hook for six. Do not take your eyes off this. Every ball is an event.

Graeme Smith
Ex-South Africa captain on BBC Test Match Special

"That rattled Ben Stokes. It was aimed straight at his jaw."

Jonathan Agnew
BBC Test Match Special

"That really was a nasty ball."

Whoosh! Welcome to the crease, Ben Stokes. That is a real jaw-rattler from Morkel, one that nearly takes Stokes' head off. Stokes just gets a bit of bat or helmet in the way, otherwise he'd have been wearing leather. Real tough times for England here, the sort they write country music about.

Image source, Getty Images

Graeme Smith
Ex-South Africa captain on BBC Test Match Special

"In many ways, this is where South Africa have struggled in this series. They've not been able to push through the Stokes, Bairstows and Moeens."

Could Taylor have done better? He was playing half-forward to a ball not that full. Should he have been back? It was almost like he trying to turn the ball on the leg side. Curious. As for Bavuma, he had his revenge for the flying bat. Ben Stokes the new man.

Graeme Smith
Ex-South Africa captain on BBC Test Match Special

"Temba Bavuma did so well, he knew he couldn't get it first grab so he parried it and bought himself time. Brilliant fielding - you've got to love the buzz and the energy Bavuma brings whatever he does."

Jonathan Agnew
BBC Test Match Special

"James Taylor is replacing his gloves, that'll be the reason why his bat flew out of his hands."

I've just seen a replay of that Compton wicket. It really was a nothing shot. Mile wide off the off stump, short, Compton playing with a straight bat and trying to force. Catching practice. Rabada to Root, three slips and a gully. Good line, Root defends, then tries a very iffy upper-cut to one short of a length. England never far from danger.