The legspinner's seam-up, quicker delivery

Piyush Chawla had dismissed KL Rahul in his third over, and was now bowling his fourth with AB de Villiers on strike. Having given no warning of any exotic variations apart from his regular legbreak and googly in his first 3.3 overs, he surprised de Villiers with a quick, seam-up ball. The adjective quick doesn't quite do justice to it - de Villiers barely managed to bring his bat down as the ball shot through, with the angle, from just back of a length and struck him on the back pad, in line with off and middle. It was the fourth time Chawla had dismissed de Villiers in the IPL - no other bowler had got him out more than three times. And having bowled 38 balls to him, Chawla had only conceded 34 runs.

It was the 17th over of Royal Challengers' innings, and Virat Kohli had just reached his half-century. Morne Morkel sent down a short ball, and Kohli shaped to pull, but had to drag the ball from well outside off stump. The bounce caused him to top-edge it, and the ball climbed high above Bangalore before descending towards Gautam Gambhir at point. The Kolkata Knight Riders captain positioned himself under it, his eyes widening in anticipation, and then dropped it, the ball clanging off his palms and onto the turf.

Guilt, frustration and calculations of how much the drop would cost his side must have swirled through Gambhir's mind at this point. But they would not swirl for too long. Morkel ran in again, and delivered a fuller ball, once again wide of off stump. Kohli reached out, sliced it in the air, squarer than he might have intended, and picked out Andre Russell on the cover boundary.

Umesh Yadav began the 18th over well, confounding Sachin Baby with a well-directed slower ball. His next ball was not as good, perhaps an attempted yorker that slipped out of his fingers and ended up as a wide, chest-high full-toss outside off stump. The square-leg umpire signalled no-ball for height.

Umesh ran in again, and once again let slip a high full-toss, this time close enough to the batsman to count not just as a no-ball but also an official warning for dangerous bowling. Had umpire S Ravi been strict enough to warn Umesh for the first offence as well, he would have had to take him out of the attack.

Given what came afterwards, Umesh may have preferred not to continue bowling. Shane Watson hit his next ball for four, and Baby ended the over with two fours and a six. In the 20th over, Stuart Binny hit him for six, four and six off successive balls, and Umesh finished with figures of 1 for 56.

Yuzvendra Chahal has made a name for himself at Royal Challengers, and has done so while bowling most of his overs with batsmen itching to hit him over the small boundaries at the Chinnaswamy Stadium. Against Knight Riders, he came on with the additional pressure of bowling inside the Powerplay.

Chahal began with a near-perfect delivery. The ball turned less than Chris Lynn expected, and beat the inside edge of his forward defensive, but turned just enough to produce a loud lbw shout. It wasn't upheld, and replays showed it was a 50-50 decision, with the ball on track to possibly clip the outside of leg stump.

Three balls later, he did not need any help from the umpire. This ball was a touch slower, a touch shorter, and pitching on leg stump rather than middle. It gripped and spun past Lynn's tentative bat face and crashed into the top of off stump. Lynn's front foot was frozen to the spot, but it was Chahal's length that caused his indecision.