Johannesburg, January 27: England paceman Mark Wood sealed the second five-wicket haul of his Test career and then thanked West Indies great Michael Holding for a priceless piece of advice.
Wood's probing returned figures of 5-46 at The Wanderers as South Africa were all out for 183 on day three of the fourth Test, before England posted 248 in their second innings to set the hosts a world-record run chase.
South Africa will have two days to get the 466 runs they require to win the match and draw the series, but it is a tall order.
And with Wood showing sizzling form with the ball, South Africa may struggle to take the contest to a fifth day.
Asked about his bowling display, Wood said: "I'm over the moon."
Returning from knee and side injuries to reclaim his England place, a conversation Wood had with Holding yielded a morsel of great wisdom from the man who took 249 wickets for West Indies in 60 Tests.
By lengthening his run-up, Wood has taken some of the explosive element out of his action, which should help on the fitness front, and the suggestion came from 65-year-old Holding.
Wood told Sky Sports: "I wish I'd changed my run-up sooner. Some guy did mention it to me..."
With a nod to Holding, who is working for the broadcaster, Wood explained: "He said, 'You're putting too much strain on your body, lengthen your run-up', and since I've done that it's been a lot better.
"I've got a little bit more momentum. It takes a little bit more pressure off my body, whereas off my short run it felt like I had to force it. You're not going to have rhythm every day when you're running in.
"The days where I didn't quite feel it, I was still having to force it and I was putting that extra strain on my body, so it's been nice to take a load off and just feel my way in but still bowl quickly.
"I was stubborn to change it because it had worked for me up to a point. But if I was going to play more cricket or if I was going to improve, I was going to have to change something.
"I just felt it was the right time for me to change it. I wish I had done it earlier, but it's all in the past now."
England's second innings saw opener Dom Sibley make 44, with captain Joe Root adding 58 and all-rounder Sam Curran plundering a rapid 35.
Curran hailed Wood's efforts and reflected the mood in the camp by stressing the tourists are on a high, with their victory prospects looking strong.
Curran told the BBC's Test Match Special podcast: "It's a great position to be in at the close, maybe we would have liked to have been batting tomorrow, but the lead is nice.
"It was nice to have a bit of fun out there with Rooty. Woody with five wickets, what a man, the team is so happy, he's one of the great guys in cricket. For him to come back from injury and get five is amazing."