Asked if 72 runs scored by the South Africans in 72 overs today came as a shocker, Yadav admitted that it was indeed so.
"Yes it's a surprise as we did not think that they would play like this. The way they are defending is a surprise and they are not even trying to play a shot. Even deliveries they can score are being defended," Yadav told mediapersons at the day-end conference.
"Yes it becomes a challenge when batsman does not play a shot as chances of getting a player out decreases. When a batsman does not take any initiative then even if you bowl a good delivery, he will just block it out. I can tell you this kind of cricket can be very boring, because you just are bowling over after over and nothing is happening," he said.
"It becomes so boring that you start thinking as to whether something will happen or not," Yadav said in reference to Hashim Amla's unbeaten 23 off 207 balls.
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Yadav said the Proteas would not be able to survive an entire fifth day tomorrow by mere defending.
"Yes, there is pressure on them and that is the reason they are blocking everything and trying to stretch this game. Our first target tomorrow morning will be to dismiss them as quickly as possible. So I don't think that they will survive the whole day without giving any catches," he said.
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Yadav said that the objective behind not enforcing follow-on was to bat the visitors out of the game.
"And we did score runs in that first hour. Normally, I don't think there will be much of a problem to get them out as we have lot of time at our disposal," said Yadav.
With the Kotla pitch getting slower with the passage of time, reverse swing is going out of play, assessed Yadav.
In fact, both Yadav and Ishant Sharma were brought round the wicket to create rough for the spinners in a bid to try something different.
"Yes, we tried to create a few patches so that the spinners get some kind of help. With no pace or bounce, it was difficult to get the deliveries to reverse. So we thought any patches that we could create will be good for our spinners."