Having located a newfound ruthlessness, Root knows the job is barely even half done in this first innings. He remembers Chennai in December 2016, England’s last Test before he became captain, when they made 477, only to concede 759 and lose by an innings. He knows it takes just a moment of madness to spark a collapse, that Kohli and his formidable batting lineup cannot wait for their turn, and that India’s attack is in a different league to Sri Lanka’s. Again, there is a world-class spinner, R.Ashwin, supported by two others. But now, in Jasprit Bumrah and Ishant Sharma, there are two seamers skilled enough to find reverse swing in the match’s first session.