Although it appears from the video that Naveen Ul Haq of Afghanistan was at the center of the controversy, Kohli was actually in the thick of it for the majority of the game. While LSG coach Gambhir had some input into the crowd-mocking during their previous match at the Chinnaswamy Stadium after LSG won a nail-biter, it appeared Kohli was paying it forward at the Ekana with some prodding celebrations each time LSG lost a wicket during the chase.
However, it was the final ball of the 17th over that seemed to set off both Kohli and Gambhir's emotions, which eventually overflowed. After giving up eight runs off the first five balls of his third over, Siraj bowled a dot—a fuller delivery shot at Naveen's pads—and then gave him the silent treatment before throwing the ball at the batter's end stumps with Naveen well within the crease.
After a brief conversation between Naveen and Siraj, Kohli stepped in. Amit Mishra, the senior batsman for LSG, attempted to calm Kohli down, but Kohli, in his customary heated on-screen persona, exchanged words with Mishra as well. When Naveen charged at Kohli, the umpires had to step in. After that, Kohli was clearly upset and expressed his feelings to the umpires.