PUNE: A wicket-keeper is a wicket-taker too. Fielders are wicket-takers too. They are bowlers’ performance-enhancing substances. India, though not entirely flawless on the field, hit home this point in an emphatic fashion when they enforced the follow-on and dismissed South Africa for 189 inside 70 overs to win the second Test by an innings and 137 runs with a day to spare at Gahunje stadium here on Sunday. SCORECARD The hosts have now taken an unassailable 2-0 lead in the three-match series. The third Test starts in Ranchi on Saturday. Virat Kohli’s men have also boosted their points tally in the World Test championship after this result. The Sunday crowd, in excess of 15,000, probably got their time and money’s worth. Those who had got tickets for just the fifth day, will get a refund. Except off-spinner R Ashwin and pacer Mohd Shami in patches, no Indian bowler looked that threatening on a pitch that was losing its zip and freshness with every passing over. However, soft dismissals after being put under pressure and smart fielding were the patterns for the day. Wicket-keeper Wriddhiman Saha led from behind the wicket with two of the three dismissals inside the first 24…