From 50-1 overnight, Ben Duckett looked a key man for England, only to edge Krishna for 54. Ollie Pope came and went to leave England 106-3. India were on course.
But Brook had the audacity and skill to punch back. Root, who survived a tight lbw review from Krishna on three, is a maestro of guiding Test chases. They first halted India’s momentum, then punished a weary attack in conditions better for batting than any other time in the match.
Brook had only eight from 18 balls, then sparked into life with a pulled four and lofted off-side six off Akash Deep. In the next over came a crucial chance, with Brook on 19. A top edge off Krishna, Siraj underneath it, time standing still. Siraj took the catch, then stood on the rope.
Brook regularly heaved through the on side, Root played trademark handsome drives. The crowd rose again for Brook’s 91-ball century, reached with an edged from spinner Washington Sundar.
A dance at Deep caused Brook to lose his bat and his wicket, Root went to tea on 98. The players returned in sunshine and to another roar, matched when Root went to his 39th Test hundred. In a match dedicated to the life of his mentor Graham Thorpe, Root celebrated by pulling on one of Thorpe’s trademark white headbands, and looked to the sky.
Bethell, short of cricket and his first home Test, was tortured for his five off 31 balls, eventually bowled trying a needless hack at Krishna.
Nerves suddenly seemed to affect Root, who survived another review from Krishna, before poking the same bowler behind. From nowhere, the game was alive.