By DEREK PRINGLE

Master and apprentice is a phrase you often hear when Joe Root and Harry Brook are at the crease together. Yet the roles could so readily have been reversed in the Second Test against Sri Lanka at Lord’s, after the Decision Review System had both men lbw to balls clipping leg-stump.
The difference was ‘umpire’s call’ – in this instance saving Root, who went on to his record-equalling 33rd Test hundred but condemning Brook to an unfulfilling 33.
Root was on 11 when Lahiru Kumara, Sri Lanka’s bustling fast bowler, nipped one down the Lord’s slope to strike Root’s front pad n...