The incident happened in the 76th and final over of the Indian second innings, which was being bowled by Dhammika Prasad.
Prasad bowled a couple of bouncers which Ishant left alone and had a smile for the Lankan pacer. A bit agitated, Prasad bowled a third bouncer which was illegal and promptly signalled no-ball by the umpire.
Having exhausted his quota of two bouncers for the over, Prasad pitched one up and Ishant cut it towards point region for a single. But as he ran past Prasad, he started tapping his helmet with an obvious gesture to the fast bowler to try and hit him on the head.
Just when they were exchanging words angrily, Dinesh Chandimal while passing grazed Ishant's shirt while with some words of his own which suddenly got Ravichandran Ashwin agitated.
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Ashwin drew the attention of umpires Rod Tucker and Nigel Llong who then called up Angelo Mathews to tell him to calm his players down.
Still pretty angry at what happened, Prasad deliberately overstepped and bowled a fourth bouncer to Ishant after which he took a single.
The final delivery of the over saw Prasad dismissing Ashwin. But then as Ishant was trudging towards the pavilion, Prasad ran towards him and said a few words.